Best Answer: Best 2 out of 3 sets. Exception: In grandslam tournaments (Aussie Open, French Open, Wimbledon, US Open) and Davis Cup, the men play best 3 out of 5 sets. The average straight set win in a best two out of 3 match is probably 1hr 30min.An average 3 set match is around 2hr 10min. A 5 set match can go anywhere from 2 1/2 hours to 5 hours plus (depending on the pace of play and how close the sets are).The average set is about 40 minutes (but can be as short as 20 or can be over an hour).xception: In grandslam tournaments (Aussie Open, French Open, Wimbledon, US Open) and Davis Cup, the men play best 3 out of 5 sets. The average straight set win in a best two out of 3 match is probably 1hr 30min.