Bradley Klahn (born August 20, 1990) is an American former professional tennis player from Poway, California.

Klahn played collegiate tennis at Stanford University, where he won the 2010 NCAA Singles Championships[1] as a sophomore.

He underwent back surgery in February 2015[3] and did not resume playing until late 2016,[4] accepting a wild card into qualifying for the Challenger event in Champaign-Urbana and winning three matches to reach the main draw, where he defeated Sam Groth in the first round and Tennys Sandgren in the second before falling to Jared Donaldson in the quarterfinals.

He grew up in Poway, California, 22 miles northeast of San Diego, and admired countrymen Pete Sampras, Andre Agassi and Andy Roddick.

He won the 2006 USTA Nationals (Kalamazoo) B16s doubles and was a member of the Junior Davis Cup squad that competed in Barcelona that same year.

Klahn became just the fourth player in school history to claim both the Pac-10 Singles and Doubles Championships in the same year.

Klahn claimed the Pac-10 singles title with five consecutive straight-set victories but dropped a hard-fought, three-set decision to teammate Alex Clayton in the final of the ITA Regional Championship.

In his first career match, picked up a 6–4, 6–4 win against Kentucky's Brad Cox at the ITA All-American Championships.

He notched two different season-best nine-match winning streaks and led team in victories with a 41–8 overall record while also going 17–5 in duals and playing all his matches at the No.

He partnered exclusively with Ryan Thacher in doubles and the duo finished 40–8 overall, 17–3 in duals, 14–5 against Pac-10 opponents, 13–6 against nationally ranked foes and 11–0 in home matches.

He reached the semifinals of the D'Novo/ITA All-American Championships and captured the singles title at the Sherwood Cup, repeating as the tourney champion.

In doubles again he partnered exclusively with Ryan Thacher for team-best records overall (43–8) and in duals (19–3), while finishing 16–7 against nationally ranked foes.

He went 8–2 over his final 10 matches of the year in singles and in doubles with Ryan Thacher, compiled a 19–3 record overall and was 11–2 in duals.

They were the first tandem to capture back-to-back titles at the historic tournament since former Stanford standouts Jared Palmer and Jonathan Stark accomplished the feat in 1990–91.

[8] The American finished in Top 100 for 1st time in his career after posting a 40–17 record in Challengers and winning 2 titles in 5 finals.

In Grand Slam play Klan went 1–1, reached 2R at US Open for 2nd year in a row (l. to Lopez), fell in qualifying at Australian Open (l. to Berankis in Q2), Roland Garros (l. to Velotti in Q1) and Wimbledon (l. to Peliwo in Q1) He compiled records of 1–2 on hard, 0–1 on clay and earned a career-high $153,368.