24 August 1966|
|Height||1.93 m (6 ft 4 in)|
|Highest ranking||No. 66 (29 January 1990)|
|Grand Slam Singles results|
|Australian Open||3R (1990, 1992)|
|French Open||2R (1987)|
|US Open||1R (1994)|
|Highest ranking||No. 86 (31 July 1995)|
|Grand Slam Doubles results|
|Australian Open||3R (1995)|
|French Open||1R (1987, 1989, 1994, 1995)|
|US Open||2R (1994)|
Wahlgren was a top 100 player in both the singles and doubles.
In 1989 he had his best singles performance in an ATP Tour event, reaching the final of the Australian Indoor Championships. He defeated defending champion Slobodan Živojinović en route to the final, where he lost to Ivan Lendl.
Wahlgren was a quarter-finalist at the 1992 Brisbane Indoor Championships. Over the next two years, he twice finished runner-up in doubles at the Kuala Lumpur Open.
The further he got in the Men's Doubles at a Grand Slam was at the 1995 Australian Open, when he and partner Ola Kristiansson made it into the third round, defeating sixth seeds David Adams and Andrei Olhovskiy along the way.
Grand Prix/ATP career finals
Singles: 1 (0–1)
|Runner-up||1.||1989||Sydney, Australia||Hard||Ivan Lendl||2–6, 2–6, 1–6|
Doubles: 2 (0–2)
|Runner-up||1.||1993||Kuala Lumpur, Malaysia||Hard||Jonas Björkman|| Jacco Eltingh
|5–7, 6–4, 6–7|
|Runner-up||2.||1994||Kuala Lumpur, Malaysia||Carpet||Nicklas Kulti|| Jacco Eltingh
|No.||Year||Tournament||Surface||Opponent in the final||Score in the final|
|1.||1986||Athens, Greece||Hard||Hans-Dieter Beutel||6–4, 6–3|