The ultimate veterans dominated the Cincinnati Masters title. Roger Federer and Serena Williams played back-to-back matches in the singles finals of the Western and Southern Open, heading into the US Open 2015 fresh off their respective wins.

Both tennis icons emerged victorious in straight sets, with Federer defeating the world No. 1 Djokovic 7-6 (1), 6-3, and Williams taking the win from Simona Halep 6-3, 7-6 (5).

It was a relatively smooth road to victory for Federer who cruised through the Western and Southern Open easily without dropping a single service game. This is despite facing the top two players in the tournament in Djokovic and Andy Murray for the finals and semi-finals, respectively.

The 34-year-old Swiss played an aggressive match to win his seventh Cincinnati championship, surprising the crowd by attacking the service line during his opponents' second serves. According to a report by ESPN, Federer began using the technique in practice as a "playful respite." When the practice worked out well for him, he decided to implement it in actual matches.

When asked if he plans to continue executing the same way against other top players, he responded, "Why not? It's very important that I'm playing tennis that I can enjoy. I'm coming to the net, serving and volleying, doing something I didn't do as much earlier in my career."

Despite his masterful performance over the week, Federer remained modest and cautious on his chance to win his 18th Grand Slam title at Flushing Meadows.

"To be quite honest, I don't think that far ahead because I haven't been in a final since 2009," he said, in a report by The Guardian. He acknowledged the tough competition that he will have to face during the tournament saying, "So I've got my work cut out. Usually everybody does play well in New York. It's a fair surface, good court. Everybody knows it's the last chance [of the year] to do well at a slam."

There are not many tennis players with more Grand Slams than Federer, but Serena Williams is one of them. The 21-time Grand Slam winner struggled in this particular Masters title, but found a way to win decisively for her second championship in Cincinnati.

Williams has had an incredible year, with the opportunity to complete a calendar year Grand Slam in the US Open. The last player to win all four Grand Slams in one year was Steffi Graf in 1988.

There's no doubt that Williams is saving her energy for the US Open coming up, but she acknowledges the importance of getting the Masters title at this point.

"The win here helps me," she said, in The Guardian. "It also makes me realise the feeling of winning. It's ridiculous. I like that feeling and want to do the hard work and listen to Patrick and all the stuff that he tells me."

The US Open begins on August 31.