<|system|>
Can you answer this?</s>.
<|user|>
How many grand slams did Boris Becker win?
<|assistant|>
Boris Becker won a total of six Grand Slam titles during his career. He won Wimbledon in 1985, 1986 and 1989, the US Open in 1989 and the Australian Open in 1991 and 1996.