Ravi Shastri has hit 6 sixes in an over in a test match.
Every cricket match can have only a maximum number of outs or wickets. If it is a 20-20 or One day international there can be a maximum of 20 outs in a match. In case of a test match there can be a maximum of 40 outs in one match.
Virendra Sehwag scores maximum number of runs in a single day in test match.
Maximum 6 runs
Al Valentine is the cricket player who bowled maximum number of overs in a test match day. He is closely followed by one LO Fleetwood-Smith.
JH Kallis of South Africa has maximum number of man of the match awards in test cricket. 23 times in 162 matches. Check this link http://stats.espncricinfo.com/ci/content/records/283704.html
Sachin Tendulkar of India with 62 Man of the Match awards
There isn't a maximum number of aces that a tennis player can make in a single tennis match. For example, Wimbledon has no tie-breaker in the fifth set, so the fifth set is limitless, so there is no maximum number of aces.