“The switch was very easy. Even though he had won early in the year with another driver, he was not driving it good at all. He is very loyal to our team and our products that he came to us to find a new driver. He instantly loved the look of the Z 585 and once we started testing the numbers were exactly what he was looking for. His main comment about the driver is how his misses are minimal and he can hit all the shots he wants to.”
After Lowry's loan spell at Leeds was coming to an end, on 11 May he signed a new two-year contract extension at Aston Villa. It was a remarkable few days for Lowry, he was promoted with Leeds, received a call up to Australia's World Cup Squad and on the same day he signed a new two-year deal with Villa. Despite signing a contract with the club, Leeds United was considering re-signing him for the second time ahead of the 2010–11 season, but never happened.
Lowry made his professional debut in the 2009–10 UEFA Europa League in an away fixture at Rapid Vienna. On 17 September 2009, Lowry signed a three-month loan deal with Football League Championship side Plymouth Argyle. Lowry made his Plymouth Argyle debut on 19 September 2009, playing 90 minutes, in a 3–1 loss against Newcastle United. He played 13 league games for Plymouth during his loan spell, where he impressed many and was recalled by Villa who required Lowry's services as cover after some injuries to defenders.
In June 2015, he became the first SMU Mustang to win the NCAA individual championship, recording a score of 280 (−8) to win by one stroke. In August, he won the U.S. Amateur title, defeating Derek Bard 7 & 6 in the 36-hole final. He became the fifth player to win both the NCAA and U.S. Amateur titles in the same year, joining Jack Nicklaus (1961), Phil Mickelson (1990), Tiger Woods (1996), and Ryan Moore (2004).
At the first FedEx Cup playoff event, Fowler finished T52 at The Barclays in the last week in August. The following week he again finished T52 at the Deutsche Bank Championship, the second FedEx Cup playoff event, after carding a disappointing six-over par final round 77. At that point Fowler was positioned 37 in the FedEx Cup points standings and required a strong performance at the BMW Championship to qualify in the top thirty for The Tour Championship; a performance which eluded him, finishing in 48th place. In finishing 43rd in the FedEx Cup, Fowler earned a $132,000 bonus.
At the first FedEx Cup playoff event of the season, The Barclays, Fowler went into the final round leading the event by one stroke. He endured a difficult final round, shooting a two-over-par 74. His challenge was ended with a double-bogey at the 16th hole that put him four strokes behind playing partner Patrick Reed. He went on to finish T7, three strokes behind the winner Reed. As a result of this, Fowler also failed to secure his automatic Ryder Cup spot, which he would have done with a top-three finish. Fowler moved up from 28th to 16th in the FedEx Cup standings with this result.
The Barclays: Held a one-stroke lead over Patrick Reed after 54 holes at The Barclays in the FedExCup Playoffs, before a double bogey-birdie-bogey finish on Nos. 16-18 resulted in a T7 at 6-under 278 with Jason Kokrak and Ryan Moore. Fowler went bogey free at Bethpage Black from the 10th hole in round one until the 11th hole in the final round, a span of 55 holes. His 55-consecutive holes without a bogey became a personal best on the PGA TOUR, besting 53 from the 2010 Memorial Tournament. This streak also marked the longest recorded in Barclays history since hole information began in 1983. Ian Poulter had the longest with 45 in 2010. The finish marked his third top-10 showing in his last four starts in the event (T9/2013, T9/2014).