Petr Kralert (born 20 October 1979) is a former professional tennis player from the Czech Republic.

[1] Kralert had a good year as a junior in 1996, when he won the Banana Bowl; was a doubles champion at the Orange Bowl, partnering countryman Robin Vik; and bagelled Roger Federer when he beat the future World No.

In 1999 he made an appearance for the Czech Republic Davis Cup team, in a World Group play-off tie against Uzbekistan.

He defeated Oleg Ogorodov in the fourth rubber, to help the Czechs secure a clean sweep.

[3] Kralert qualified for his only Grand Slam tournament in 2000, at the US Open.