Turning professional in 1989, he made the round of 16 as a wildcard at Kitzbühel that year, withs wins over Tomás Carbonell and world number 12 Alberto Mancini.

He played a reverse singles match in the first, against Czechoslovakia in Prague, which he won over Karel Nováček, but the Austrians had already lost the tie.

Buchmayer featured in the doubles match with Alex Antonitsch, which they lost to Kelly Evernden and Brett Steven.

He and partner Thomas Strengberger accounted for top seeds Luis Lobo and Andrei Olhovskiy in the semi-finals, but were unable to get past the Australian pairing of Wayne Arthurs and Richard Fromberg in the title decider.

[4] He played in his fourth and final Davis Cup tie for Austria in 1998, the doubles rubber against Israeli players Noam Behr and Eyal Erlich in Ramat Hasaron.