Office fan and professional tennis player,
Andy Roddick.
On the latest episode of 'Office Ladies' they reveal that Jan's baby daddy is none other than the famous tennis pro!!!
via Mashable, 'For the rest of the series fans remain in the dark about the identity of Jan's sperm donor — aside from a quick scare that it was Kevin (Brian Baumgartner), who also occasionally donates sperm to the bank by IHOP. But Kinsey and Fischer finally shared whose sperm Jan bought, which was revealed in a deleted "Goodbye, Toby" scene.'