Every week Baseline will select a “Player of the Week.” That athlete may not always win the highest category tournament that week, but perform the best compared to their recent playing history.

Caroline Wozniacki is back at the top. While she's not back to world No. 1 (although she's close at No. 3), she just won the biggest title of her career, the WTA Finals in Singapore. The year-end championship seemed likely to be overtaken by other prospects, like world No. 1 Simona Halep, or experienced veteran Venus Williams.

However, it was the Dane that proved victorious, powering past Williams in straight sets, 6-4, 6-4.

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Wozniacki won every match, except a tough three-setter against Caroline Garcia, including revenge over Elina Svitolina (who beat her in two Premier 5 finals this year). It's the first time since early 2012 that Wozniacki is inside the Top 3.

The 27-year-old's previous best showing at the WTA Finals was when she reached the final in 2010. Wozniacki had never defeated the older Williams sister in the last seven times they played against each other, but the eighth time proved to be the charm.

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Wozniacki reached six finals in 2017 before finally winning a title in Tokyo. Now she ends the season on the highest note.