Will Mackenzie

Will Mackenzie has five top-10 finishes in 13 starts this season.

Mackenzie jumps into top 15 in latest U.S. Ryder Cup standings

The only change in this week's top nine of the U.S. Ryder Cup standings involved Zach Johnson and Phil Mickelson, who flip-flopped up to No. 7 and down to No. 8, respectively.

Johnson tied for sixth at the Valero Texas Open to make his move on Sunday, while Mickelson withdrew from the tournament 10 holes into the third round on Saturday citing an oblique strain.

2014 RYDER CUP: U.S. points standings | How U.S. Points are earned | Team USA | Team Europe

Here's a look at the current top 12 (remember, the top nine after the PGA Championship in August automatically qualify, while U.S. Captain Tom Watson fills out the team with three captain's picks):

1. Jimmy Walker
2. Dustin Johnson
3. Patrick Reed
4. Bubba Watson
5. Jason Dufner
6. Harris English
7. Zach Johnson
8. Phil Mickelson
9. Webb Simpson

10. Ryan Moore
11. Chris Kirk
12. Matt Every

You have to go all the way down to No. 14 this week to find the biggest mover into the top 20 -- Will Mackenzie. Mackenzie tied for second at TPC San Antonio to notch his fifth top-10 finish in 13 starts this season. It propelled him from No. 23 to No. 14 in this week's standings.

Matt Kuchar jumped from No. 25 to No. 19 thanks to his tie for fourth.

Tiger Woods did not play in Texas and dropped from No. 41 to No. 44.

This week, the PGA Tour heads to the Golf Club of Houston for the Shell Houston Open -- the last event before next week's Masters.

Follow T.J. Auclair on Twitter, @tjauclair.