WHITFIELD: All right, a huge day for Serena Williams, call it yet again, the Serena slam. Today, the world's number one women's tennis player won her sixth Wimbledon crown and her 21st grand slam title overall. Joining me right now is Christina Macfarland from the All England Club. Christina, that's four majors in a row in this calendar year, this Serena slam. I mean, last year, it seemed like it was anomaly, but here we go again. She is amazing.</s>CHRISTINA MACFARLAND, CNN CORRESPONDENT: She is absolutely incredible. It is hutting up here now with that potential calendar grand slam. Thirteen years after she took her first Wimbledon title here. She has followed up with her sixth, as you mentioned, her 21st grand slam of her career. But, you know what? It wasn't an easy match for her here in the finals. She went down early in the first game of the first set. She was broken against the young 21-year-old, Garbine Muguruza, trying in her first ever Wimbledon grand slam final. Serena had to battle back. She hit serves of 123 miles an hour against her young opponent and eventually she wrapped up the match 6- 4, 6-4. She dropped to her knees when she knew she won it and leapt up and jumped all over the court and went over to console her opponent. But as you mentioned now, all eyes will turn to the U.S. Open next month because Serena is on for a potential calendar grand slam. That's four grand slams in one year. If she can do it, she will become the first player, men or women to win this calendar grand slam since Steffi Graf back in 1988. It's an incredible achievement for a player who is 33 years old.</s>WHITFIELD: I know that is amazing, a senior on the block so to speak and it is hard to believe, 1988 when Steffi Graf did that. This has been an amazing year for any spectator to watch tennis too. Christina Macfarland, thanks so much. Appreciate it. We'll be right back.
Victory is Serena Williams' Sixth at All-England Club