The question is, is this meaningful or classifiable. Many other animal species have been around much longer or they have shorter life spans, so they've had many more opportunities to accumulate genetic variants. Penguins, for example, have twice as much genetic diversity as humans. Fruit flies have 10 times as much.
Who wore number 20 for Boston bruins? According to azhockey.com, the number 20 has been worn by 23 different Bruins players. In this decade, Darren Van Impe, Eric Manlow, Martin Lapointe, and Wayne Primeau have all worn 20. Players to wear the jersey in the 1980s-90s were Al Secord, Mike O'Connell, Dwight Foster, Tommy Lehmann, Bob...
Del Potro briefly used the Wilson BLX Pro Tour Racquet for the 2010 season, but after returning from his wrist injury switched back to his Wilson Hyper Prostaff 6.1 95 with K Factor KSix-One 95 paint job(18x20) and strings with Luxilon Big Banger Alu Power at 62 lb, and is sponsored by Nike.