1 / 10
After starting his career on the European Challenge Tour, Koepka cashed in for his first PGA Tour victory at the Waste Management Phoenix Open. A brief injury setback slowed his momentum, but Koepka healed up enough to post seven straight top-18 finishes over the summer, highlighted by a tie for fifth at the PGA Championship. Though he was controversially passed over as a captain's pick for the Presidents Cup, Koepka enters 2016 ranked 16th in the world.
2 / 10
The 30-year-old Piller remains in search of her first LPGA title, and took important steps toward that goal in 2015, with runner-ups at the Meijer LPGA and CME Tour Championship. That said, Piller is now best known for making a do-or-die putt that kept America's hopes alive as they rallied in singles at the Solheim Cup.
3 / 10
The reigning Rookie of the Year, Berger nearly notched his first PGA Tour win at the Honda Classic before falling short in a playoff to Padraig Harrington. He picked up an additional runner-up at the BMW Championship and was the only rookie to qualify for this year's Tour Championship, finishing 11th in the FedEx Cup standings.
4 / 10
All the way down at 236th in the world to start the year, Kisner finished second four times in 2015, losing in playoffs at the RBC Heritage, the Players and the Greenbrier before a more ordinary runner-up at the HSBC Champions. After so many close calls, Kisner finally broke through for his first PGA Tour at the RSM Classic. In one year he moved up 219 spots, to 17th in the world.
5 / 10
The 23-year-old picked up his first professional victory at the Web.com Tour's Pacific Rubiales Colombia Championship in February and later earned Special Temporary Status on the PGA Tour thanks in large part to a runner-up finish at the Wells Fargo Championship. He followed it up with a solo-third at the Barracuda Championship and a T-6 at the Frys.com Open. Rodgers is now a full-time member of the Tour for the 2015-16 season after finishing inside the FedEx Cup's top 125 as a non-member.
6 / 10
At 17 years old, Henderson won on the Symetra Tour in June and then took the LPGA's Portland Classic by eight shots in August. Though not yet 18, Henderson was granted LPGA membership by commissioner Mike Whan following her victory. Henderson is the third-youngest player to have ever won an LPGA event, behind Lydia Ko and Lexi Thompson.
7 / 10
The 2013 U.S. Amateur champion earned low-am honors at the 2013 Open Championship and 2014 U.S. Open before turning pro. A European Tour member in 2015, Fitzpatrick was runner-up at the Omega European Masters in July and earned his first win at the British Masters in October. The 21-year-old is now 43rd in the world, up from 413th.
8 / 10
DeChambeau in 2015 became just the fifth player in history to win the NCAA Championship and the U.S. Amateur in the same year. The 22-year-old's future was thrown into flux when SMU was hit with a postseason ban by the NCAA, prompting DeChambeau to leave school. A month after his decision, he earned a second-place finish at the Australian Masters in November. DeChambeau is expected to turn pro after playing the Masters in April.
9 / 10
Unlike some of the other names on this list, Scott is neither an up-and-comer nor a late bloomer. The former world No. 1 appears on this list thanks to the game's new anchoring ban. Scott bounced back and forth between putters with little success preparing for 2016, making 2015 his first year since 2001 without a single worldwide victory.
10 / 10
After some notable Sunday struggles pursuing his first PGA Tour win last year as a rookie, Thomas figured out how to put away the CIMB Classic this fall in Malaysia. In his brief PGA Tour career, the 22-year-old already has 10 top-10 finishes. He, along with his close friends, Patrick Rodgers and Jordan Spieth, lead the Tour's dominating youth movement.
Image of Bryson DeChambeau and how his body has transformed, through the years, from an NCAA champion to becoming a multiple PGA Tour winner.
Here's a look at some of the best photos of the Match II with Tiger Woods, Peyton Manning, Phil Mickelson and Tom Brady from Medalist Golf Club.
A look at some of the best photos from the TaylorMade Driving Relief, won by the team of Rory McIlroy and Dustin Johnson.