He turned professional in 1993 and began playing on the
Asia Golf Circuit, where his best finish was runner-up at the
Sampoerna Indonesia Open, losing in a playoff against
Gary Webb. Later during his first year as a professional he won three events on the European second tier
Challenge Tour, two of them co-sanctioned by the
Swedish Golf Tour, why he was awarded the
1993 season Swedish Golf Tour Order of Merit winner. From 1994 until 2018, he played regularly on the
European Tour, every season except for 1999. He qualified for the U.S.-based
PGA Tour at the 1997
Qualifying School, and played the PGA and European Tours concurrently in 1998, without success and in 1999 found himself back on the Challenge Tour. Since then he concentrated on playing in Europe. He finished tenth on the 2001 European Tour Order of Merit, after being lone runner-up to
David Duval at the
2001 Open Championship at
Royal Lytham & St Annes Golf Club,
England. After a closing round of 67, Fasth advanced from tied 20th and was the leader in the club house for two hours, before late starting Duval also closed with 67 and won by three strokes. His 2001 performances enabled Fasth to qualify for the European team at the
2002 Ryder Cup, at
The Belfry,
England, where he contributed to a European 15½ to 12½ victory, with a halved match against
Paul Azinger in the Sunday singles. In both
2005 and
2006, Fasth won twice on the European Tour and finished 13th and 15th respectively on the Order of Merit. He finished lone fourth at the
2007 U.S. Open at
Oakmont Country Club,
Pennsylvania, two strokes after winner
Ángel Cabrera. The week after, Fasth won his sixth
European Tour event, the
BMW International Open in
Munich,
Germany, ahead of home hero
Bernhard Langer. These performances helped Fasth to a career best fifth-place finish on the
2007 European Tour Order of Merit. In
2018, he only played a few tournaments on the European Tour and his last tournament came to be the 2018
Scandinavian Invitation on his home club,
Hills Golf and Sports Club, after which he retired from tournament golf. Fasth has featured in the top 20 of the
Official World Golf Ranking with a personal best of 18th for three weeks in October 2007. After turning 50, in April 2022, Fasth became eligible for senior tournaments, why he came back to tournament golf. The first year he played eleven tournaments on the
European Senior Tour, renamed the Legends Tour, making eight cuts and finished 60th on the
2022 Legends Tour Order of Merit. His best finish was tied 15th at the
Farmfoods European Senior Masters. His equipment sponsor has always been
Callaway Golf. Since 2019, after his regular competitive career, Fasth has worked for the
Swedish Golf Federation, as an adviser and coach for the Swedish national amateur team. == Personal life ==