When was the American professional mixed martial artist born who is ranked #13 as of July 21, 2017 and also a trainee of Matt Hume?
Matt Hume: Matt Hume (born July 14, 1966) is an American mixed martial artist. Tim Boetsch: Timothy A. Boetsch ( ; born January 28, 1981) is an American professional mixed martial artist currently fighting in the Middleweight division of the Ultimate Fighting Championship. Tim Boetsch:  As of July 21, 2017, he is ranked #13 in official UFC Middleweight rankings.
i don't know