What the app is
AceTracker is a live tennis match tracking and player statistics platform. It displays a real-time scorecard for a US Open semifinal between Carlos Alcaraz (ESP, #1) and Jannik Sinner (ITA, #2), along with detailed in-match statistics, head-to-head history, tournament context, and live win probabilities. The app is labeled a "mock UI" and sources all data from a single static JSON file.
Match snapshot from data: US Open 2026 · Arthur Ashe Stadium · Semifinal · In Progress (2h 47m)
Score: Alcaraz leads 2–1 sets (6-4, 6-7(5), 7-6(4), 3–4* in progress)
Current game: Sinner serving · 30–40 · break point for Alcaraz
Win probability: Alcaraz 58% · Sinner 42%
Alcaraz ESP [1]
6
6
7
3
142
Sinner ITA [2]
4
7
6
4*
138
Behavior observed
- The page loads with a "Loading match data…" spinner while it fetches the JSON from the external data source.
- The header renders "AceTracker · Live Match" as the page title, with a tagline "Match intelligence."
- Match data populates to show the tournament name, round, court, player names/rankings, and set-by-set score.
- Per-player statistics are available in the JSON (aces, double faults, serve speeds, winners, unforced errors, break point conversion, etc.) and are presumably displayed in a stats panel.
- A head-to-head record (6–6 all-time) and the most recent meeting (Wimbledon 2026, Alcaraz won) are included in the data.
- Live win probabilities (Alcaraz 58%, Sinner 42%) are present in the JSON but it is unclear if they update dynamically or are static values rendered once.
- A footer credits the data source and labels the app as a "mock UI."
Things that didn't work as expected
- Entirely static data — the match is labelled
"status": "In Progress" but all scores, statistics, and win probabilities are frozen at a single snapshot. Nothing updates in real time, making the "Live Match" branding misleading.
- Win probability is stale —
liveOdds.lastUpdated is a hardcoded timestamp (2026-09-11T21:47:32). There is no mechanism to refresh this value, so it will always display the same probability regardless of when the page is loaded.
- No confirmed interactive elements — the page description gives no indication of tabs, toggles, or drill-down views for player stats. The UI may render everything as flat read-only text with no way to switch between views.
- Break point context missing from UI — the JSON records a break point situation in the current game (
"breakPoint": true, 30–40), which is a high-drama moment, but there is no indication this is surfaced prominently in the UI as an alert or highlight.
- No match simulation or progression — for a mock UI, there is no "advance point" or playback feature to demonstrate how the interface would behave as the match evolves.
- Prize money and attendance unused — the JSON includes rich tournament metadata (total prize pool $65M, attendance 23,771) that would add context but likely goes undisplayed.
- No back-to-gallery link — no path back to the 65-apps index for visitors arriving via the Random button.
Prompt to improve the app
Improvement prompt
- Add a match simulation mode — include a "Simulate point" button that advances the current game score point-by-point using realistic tennis scoring logic (15, 30, 40, deuce, advantage), updating the scoreboard, stats counters, and win probability with each click to demonstrate the live UI in action.
- Highlight the break point moment — when
breakPoint is true, surface a visually prominent alert banner (e.g. "BREAK POINT — Alcaraz") above or within the scoreboard so the critical game situation is immediately visible.
- Add a tabbed stats panel — split player statistics into tabs: Serve, Return, Rally, and Overview. This makes the dense stat block scannable and lets users focus on the metrics they care about.
- Surface tournament metadata — display the prize money breakdown, attendance figure, and court name in a contextual sidebar or info card to make the app feel like a full broadcast-style experience rather than a bare scorecard.
- Animate the win probability bar — render the 58/42 probability split as an animated horizontal bar that updates smoothly whenever the simulated score changes, giving users a visceral sense of match momentum.
- Add a back-to-gallery link — include a subtle footer link back to producingtechnology.com/65-apps so visitors who arrive via the Random button can explore the rest of the collection.