diff --git a/README.md b/README.md
index 106a6ba..c8f82ff 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,9 @@
   - 可從資料庫讀取歷史列表。
   - 點開單筆可查看得分過程。
   - 每筆資料可刪除，刪除前會顯示確認提示。
+- 今日場次
+  - 選隊伍面板每個人名字旁顯示 `今日 N 場`，每次結算幫上場的人各加一場，存在本機、跨日歸零。
+  - 面板的 `同步今日場次` 按鈕會從 `history` 表撈今天（本機時區）的比賽，把每個人的今日場次覆蓋成 DB 的數字，跨裝置記分時用來補齊其他裝置上傳的場次。
 - 出席率統計
   - 歷史戰績頁的 `出席率統計` 按鈕會彈窗顯示每個人的出席狀況。
   - 資料取自 `attendance` 表（TG 報名 bot 每天每人一列），不是 `history` 表，所以有報名到場但沒被記分的場次也算出席；當天名單還沒存進 `badminton` 表也已經算得到。
diff --git a/server/server.mjs b/server/server.mjs
index 487b3bc..e8e5666 100644
--- a/server/server.mjs
+++ b/server/server.mjs
@@ -528,6 +528,63 @@ app.get('/api/history', async (request, response) => {
   }
 })
 
+// 指定時間區間內（通常是「今天」）每個人在 history 表打了幾場，
+// 讓不同裝置記分後可以把本機的今日場次同步成 DB 的數字。
+app.get('/api/history/play-counts', async (request, response) => {
+  if (!pool) {
+    response.status(500).json({
+      ok: false,
+      message: `DB 尚未設定完成，缺少 ${missingEnv.join(', ')}`,
+    })
+    return
+  }
+
+  const from = Number.parseInt(request.query.from, 10)
+  const to = Number.parseInt(request.query.to, 10)
+
+  if (!Number.isFinite(from) || !Number.isFinite(to) || from >= to) {
+    response.status(400).json({
+      ok: false,
+      message: '時間區間格式不正確。',
+    })
+    return
+  }
+
+  try {
+    await ensureHistoryTable(pool, historyTableName)
+    const [rows] = await pool.execute(
+      `SELECT players FROM \`${historyTableName}\` WHERE time >= ? AND time < ?`,
+      [from, to],
+    )
+    const counts = {}
+
+    rows.forEach((row) => {
+      parseAttendanceNames(row.players).forEach((name) => {
+        // 輪空等佔位字不是真的有人上場。
+        if (ATTENDANCE_IGNORED_NAMES.has(name)) {
+          return
+        }
+
+        counts[name] = (counts[name] ?? 0) + 1
+      })
+    })
+
+    response.json({
+      ok: true,
+      data: {
+        counts,
+        matches: rows.length,
+      },
+    })
+  } catch (error) {
+    console.error('history play-counts error:', error)
+    response.status(500).json({
+      ok: false,
+      message: error instanceof Error ? error.message : '讀取今日場次失敗。',
+    })
+  }
+})
+
 app.delete('/api/history/:id', async (request, response) => {
   if (!pool) {
     response.status(500).json({
diff --git a/src/App.css b/src/App.css
index 97dca1c..2d5e0bd 100644
--- a/src/App.css
+++ b/src/App.css
@@ -1540,10 +1540,27 @@
 
 .team-picker-actions {
   display: grid;
-  grid-template-columns: 1fr 1fr;
+  /* 同步今日場次 / 自動選擇 / 確認 三顆並排，確認稍寬一點當主要按鈕。 */
+  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.2fr);
   gap: 10px;
 }
 
+.team-picker-actions button {
+  white-space: nowrap;
+}
+
+/* 同步今日場次的結果或錯誤訊息，放在按鈕列上方。 */
+.team-picker-sync-note {
+  margin: 0 0 8px;
+  padding: 6px 10px;
+  border-radius: 10px;
+  color: #5c4633;
+  background: rgba(255, 255, 255, 0.6);
+  box-shadow: inset 0 0 0 1px rgba(199, 155, 83, 0.22);
+  font-size: 0.78rem;
+  line-height: 1.4;
+}
+
 .team-picker-ghost,
 .team-picker-confirm,
 .team-picker-clear {
@@ -2670,6 +2687,19 @@
     font-size: 0.86rem;
   }
 
+  /* 手機版面板很窄，同步按鈕獨占一列，下面才是自動選擇 / 確認。 */
+  .team-picker-actions {
+    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
+  }
+
+  .team-picker-sync-button {
+    grid-column: 1 / -1;
+  }
+
+  .team-picker-sync-note {
+    font-size: 0.72rem;
+  }
+
   .preset-team-list {
     gap: 6px;
     max-height: min(42dvh, 300px);
diff --git a/src/App.tsx b/src/App.tsx
index be7af27..92ecbd5 100644
--- a/src/App.tsx
+++ b/src/App.tsx
@@ -3,6 +3,7 @@ import { NavLink, Route, Routes, useLocation, useNavigate } from 'react-router-d
 import './App.css'
 import {
   createLiveRoom,
+  loadHistoryPlayCounts,
   loadMatchResults,
   releaseLiveRoom,
   rememberCertNotAfter,
@@ -939,6 +940,20 @@ function App() {
     })
   }
 
+  // 從 DB 的 history 表撈今天（本機時區）的比賽，把每個人的今日場次覆蓋成 DB 的數字。
+  // 跨裝置記分時，其他裝置上傳的場次本機沒有紀錄，靠這個補齊。
+  const syncPlayCountsFromHistory = async () => {
+    const dayStart = new Date()
+    dayStart.setHours(0, 0, 0, 0)
+    const from = Math.floor(dayStart.getTime() / 1000)
+    const to = from + 24 * 60 * 60
+
+    const result = await loadHistoryPlayCounts(from, to)
+    setPlayCounts(result.counts)
+
+    return result
+  }
+
   const skipUpload = () => {
     void finalizeLiveRoom().finally(() => {
       recordPlayedMatch()
@@ -1140,6 +1155,7 @@ function App() {
               voiceAnnouncement={voiceAnnouncement}
               targetDate={targetDate}
               onApplyMatchup={applyMatchup}
+              onSyncPlayCounts={syncPlayCountsFromHistory}
               onCloseFinishDialog={closeSettlementDialog}
               onConfirmUpload={uploadSettledMatch}
               onOpenFinishDialog={openSettlementDialog}
diff --git a/src/lib/api.ts b/src/lib/api.ts
index af945e3..f4691f3 100644
--- a/src/lib/api.ts
+++ b/src/lib/api.ts
@@ -2,6 +2,7 @@ import type {
   AttendanceStats,
   HistoryListItem,
   HistoryListPage,
+  HistoryPlayCounts,
   HistoryRecord,
   HistoryUploadPayload,
   HistoryUploadResponse,
@@ -154,6 +155,26 @@ export async function loadAttendanceStats(): Promise<AttendanceStats> {
   return payload.data
 }
 
+// 讀取 history 表在 [from, to) 秒級時間區間內每個人打了幾場。
+export async function loadHistoryPlayCounts(from: number, to: number): Promise<HistoryPlayCounts> {
+  const response = await apiFetch(`/api/history/play-counts?from=${from}&to=${to}`)
+  const payload = (await readJsonSafely(response)) as {
+    ok?: boolean
+    message?: string
+    data?: HistoryPlayCounts
+  }
+
+  if (response.status === 404) {
+    throw new Error('後端還沒更新到同步場次功能，請重新部署最新版。')
+  }
+
+  if (!response.ok || !payload.ok || !payload.data) {
+    throw new Error(payload.message ?? '讀取今日場次失敗。')
+  }
+
+  return payload.data
+}
+
 export async function deleteHistoryItem(id: number) {
   const response = await apiFetch(`/api/history/${id}`, {
     method: 'DELETE',
diff --git a/src/pages/ScoreboardPage.tsx b/src/pages/ScoreboardPage.tsx
index 533856f..85c2111 100644
--- a/src/pages/ScoreboardPage.tsx
+++ b/src/pages/ScoreboardPage.tsx
@@ -12,6 +12,7 @@ import {
 import type {
 	CourtSide,
 	GroupTeam,
+	HistoryPlayCounts,
 	PlayerSlot,
 	PointHistoryEntry,
 	RoundGroup,
@@ -85,6 +86,7 @@ type ScoreboardPageProps = {
 	onOpenFinishDialog: () => void
 	onRecordPoint: (side: ScoreSide) => void
 	onSetServing: (side: ScoreSide) => void
+	onSyncPlayCounts: () => Promise<HistoryPlayCounts>
 	onSkipUpload: () => void
 	onSwapMatchup: () => void
 	onSwapTeamPlayers: (side: ScoreSide) => void
@@ -117,6 +119,7 @@ export function ScoreboardPage({
 	onOpenFinishDialog,
 	onRecordPoint,
 	onSetServing,
+	onSyncPlayCounts,
 	onSkipUpload,
 	onSwapMatchup,
 	onSwapTeamPlayers,
@@ -124,6 +127,11 @@ export function ScoreboardPage({
 }: ScoreboardPageProps) {
 	const FINISH_HOLD_DURATION = 1000
 	const [pickerOpen, setPickerOpen] = useState(false)
+	// 從 DB 同步今日場次的進度與結果訊息，只在選隊面板顯示。
+	const [playCountsSync, setPlayCountsSync] = useState<{ loading: boolean; message: string }>({
+		loading: false,
+		message: '',
+	})
 	const [settingsOpen, setSettingsOpen] = useState(false)
 	const [draftPlayers, setDraftPlayers] = useState<string[]>([])
 	const [draftTargetScore, setDraftTargetScore] = useState(() =>
@@ -544,6 +552,32 @@ export function ScoreboardPage({
 		setDraftPlayers(shuffled.slice(0, 4))
 	}
 
+	const syncPlayCounts = () => {
+		if (playCountsSync.loading) {
+			return
+		}
+
+		setPlayCountsSync({ loading: true, message: '' })
+
+		onSyncPlayCounts()
+			.then((result) => {
+				const playerCount = Object.keys(result.counts).length
+				setPlayCountsSync({
+					loading: false,
+					message:
+						result.matches === 0
+							? 'DB 今天還沒有比賽紀錄，今日場次已全部歸零。'
+							: `已同步 DB 今天 ${result.matches} 場比賽、${playerCount} 位球員的場次。`,
+				})
+			})
+			.catch((error: unknown) => {
+				setPlayCountsSync({
+					loading: false,
+					message: error instanceof Error ? error.message : '同步今日場次失敗。',
+				})
+			})
+	}
+
 	return (
 		<>
 			{streakAnnouncement ? (
@@ -732,6 +766,7 @@ export function ScoreboardPage({
 					extraPlayerSet={extraPlayerSet}
 					group={selectedGroup}
 					playCounts={playCounts}
+					playCountsSync={playCountsSync}
 					presetTeams={presetTeams}
 					selectablePlayers={selectablePlayers}
 					selectionCount={draftPlayers.length}
@@ -742,6 +777,7 @@ export function ScoreboardPage({
 					onClose={() => setPickerOpen(false)}
 					onConfirm={confirmDraftTeams}
 					onDraftTargetScoreChange={setDraftTargetScore}
+					onSyncPlayCounts={syncPlayCounts}
 					onTogglePlayer={toggleDraftPlayer}
 					onTogglePresetTeam={togglePresetTeam}
 				/>
@@ -921,6 +957,7 @@ type TeamPickerModalProps = {
 	draftPlayers: string[]
 	extraPlayerSet: Set<string>
 	playCounts: Record<string, number>
+	playCountsSync: { loading: boolean; message: string }
 	draftTargetScore: string
 	group: RoundGroup
 	presetTeams: GroupTeam[]
@@ -933,6 +970,7 @@ type TeamPickerModalProps = {
 	onClose: () => void
 	onConfirm: () => void
 	onDraftTargetScoreChange: (value: string) => void
+	onSyncPlayCounts: () => void
 	onTogglePlayer: (playerName: string) => void
 	onTogglePresetTeam: (team: GroupTeam) => void
 }
@@ -941,6 +979,7 @@ function TeamPickerModal({
 	draftPlayers,
 	extraPlayerSet,
 	playCounts,
+	playCountsSync,
 	draftTargetScore,
 	group,
 	presetTeams,
@@ -953,6 +992,7 @@ function TeamPickerModal({
 	onClose,
 	onConfirm,
 	onDraftTargetScoreChange,
+	onSyncPlayCounts,
 	onTogglePlayer,
 	onTogglePresetTeam,
 }: TeamPickerModalProps) {
@@ -1035,7 +1075,20 @@ function TeamPickerModal({
 							})}
 						</div>
 
+						{playCountsSync.message ? (
+							<p className="team-picker-sync-note">{playCountsSync.message}</p>
+						) : null}
+
 						<div className="team-picker-actions">
+							<button
+								className="team-picker-ghost team-picker-sync-button"
+								disabled={playCountsSync.loading}
+								title="從 DB 歷史戰績撈今天的比賽，把每個人的今日場次更新成 DB 的數字（跨裝置記分用）"
+								type="button"
+								onClick={onSyncPlayCounts}
+							>
+								{playCountsSync.loading ? '同步中…' : '同步今日場次'}
+							</button>
 							<button className="team-picker-ghost" type="button" onClick={onAutoPick}>
 								自動選擇
 							</button>
diff --git a/src/types.ts b/src/types.ts
index 58b6958..8398c43 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -131,6 +131,11 @@ export type HistoryListItem = {
   winnerTeamName: string
 }
 
+export type HistoryPlayCounts = {
+  counts: Record<string, number>
+  matches: number
+}
+
 export type HistoryListPage = {
   items: HistoryListItem[]
   page: number