Question: has any team blew a 3-0 lead

Answer: Yes, The following is the list of teams to overcome 3--1 series deficits by winning three straight games to win a best-of-seven playoff series. In the history of major North American pro sports, teams that were down 3--1 in the series came back and won the series 52 times, more than half of them were accomplished by National Hockey League (NHL) teams. Teams overcame 3--1 deficit in the final championship round eight times, six were accomplished by Major League Baseball (MLB) teams in the World Series. Teams overcoming 3--0 deficit by winning four straight games were accomplished five times, four times in the NHL and once in MLB.