Tiger Woods, Phil Mickelson, Lee Westwood and Martin Kaymer in martial arts exhibition at HSBC Champions in Shanghai

1 of 5 Andy Wong/AP

Tiger Woods and Lee Westwood had some fun during a martial arts exhibition. Westwood recently passed Woods for No. 1 in the World Ranking.

2 of 5 Scott Halleran/Getty Images

Westwood is the top-ranked player in the world for the first time in his career.

3 of 5 Scott Halleran/Getty Images

Phil Mickelson played 12 tournaments this season with a chance to take the No. 1 ranking, but he never placed high enough to pass Woods.

4 of 5 Andy Wong/AP

Each of the top four players in the world took part in the exhibition.

5 of 5 Andrew Redington/Getty Images

Phil Mickelson, Tiger Woods, Lee Westwood and Martin Kaymer each have a chance to take over the No. 1 ranking this week.

Golf's top 4 in martial arts exhibition