AcesAPI

ATP and WTA tennis since 2007: match results, draws, rankings, head to head, surface Elo and odds

Official docs outline

Extra Credit builds an outline of AcesAPI's docs the first time your work uses it. Until then, start at the official documentation.

5DollarFootball Football fixtures, results, standings and historical odds with corner and card lines
API-FOOTBALL Get information about Football Leagues & Cups
ApiMedic ApiMedic offers a medical symptom checker API primarily for patients
Ball Ranks NFL and NBA fantasy rankings and player projections
balldontlie Balldontlie provides access to stats data from the NBA
Bet Better Sports model win probabilities and fair odds across 13 leagues
BirdieAPI PGA Tour golf since 2001: leaderboards, hole-by-hole scores, courses, ratings and major winner odds
Canadian Football League (CFL) Official JSON API providing real-time league, team and player statistics about the CFL
Cito UFC API UFC and MMA fight data: fighters, cards, round stats, rankings and live state
City Bikes City Bikes around the world
Cloudbet Official Cloudbet API provides real-time sports odds and betting API to place bets programmatically
CollegeFootballData.com Unofficial detailed American college football statistics, records, and results API