WATCH: Serena Williams Wins First Set at Wimbledon Final

US player Serena Williams returns against Spain's Garbine Muguruza during the women's singles final on day twelve of the 2015 Wimbledon Championships at The All England Tennis Club in Wimbledon, southwest London, on July 11, 2015.   RESTRICTED TO EDITORIAL USE  --  AFP PHOTO / LEON NEAL        (Photo credit should read LEON NEAL/AFP/Getty Images)

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It wasn’t an easy start but Serena Williams rallied back from two down to take the first set of the Wimbledon women’s final, a 6-4 victory, against Garbine Mugurza. Check out her reaction here:

Williams’ serve, which has become her trademark throughout her career, looked faulty early on, but the World No. 1 found her rhythm as she settled into the match and, slowly but surely, worked her way back into the competition. Williams is going after her 21st Grand Slam title.