Nadal took advantage of the few openings he got against John Isner, grinding out a 7-6 (8), 7-6 (3) win at the Western & Southern Open that added yet another title to his sensational summer.
The 27-year-old Spaniard won the championship in Montreal a week ago and has back-to-back hard-court championships for the first time in his illustrious career. He'd never even reached the finals in Cincinnati.
When his backhand down the line finished it off, Nadal flopped on his back and screamed.
"So it was an emotional moment."
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Williams had never won a Cincinnati title either. Like Nadal, she was trying for her second championship in two weeks, fresh off her championship in Toronto.
She dominated the first set, then fell apart, giving No. 2 Victoria Azarenka a chance to rally for a 2-6, 6-2, 7-6 (6) win that ended Williams' 14-match winning streak. Williams committed 58 unforced errors that turned the momentum.
"I just felt really off this whole week, but I was surprised to be in the final and surprised to be doing well," Williams said. "So I don't know, there's a few factors. I think what matters most was just fighting the whole time and survived to the end."
Nadal's five Masters titles this season are a career best. He's tied with Novak Djokovic for most Masters titles in a season since 1990. He's won seven of the nine Masters events during his career.