Top-seeded Serena Williams just beat Maria Sharapova in straight sets, winning 6-4, 6-4, to clinch this year's French Open. It capped a ridiculous tournament for the 31-year-old champion, who mowed down her opponents en route to the second French Open win in her career. Sharapova put up a decent fight, but Williams has now won a career-best 31 straight matches, and she's only lost three of 77 matches since last year's French Open loss. Sharapova had her moments, but Williams eventually was able to overpower the second seed. She finished with 10 aces for the day. Williams served three aces in the final game alone, and powered a serve past her opponent on championship point. With the win, Williams now has 16 major singles championships to her name to go along with 13 dou…