Lowry missed the first three cuts of his professional career, but had his first payday on 5 July, when he finished 50th at the Open de France ALSTOM.[13] He had his best professional result in November 2009, when he finished 3rd in the Dunlop Phoenix Tournament in Japan.[14] In January 2010, Lowry finished in fourth place in the Abu Dhabi Golf Championship,[15] moving him into the top-100 of the Official World Golf Ranking.[16]
Presidents Cup: Closed out his second consecutive Presidents Cup appearance with a 6-and-4 victory over Emiliano Grillo, helping lead the United States to a 19-11 win over the International Team. Compiled a 3-0-1 overall record, highlighted by victories the first two days with teammate Justin Thomas in Foursomes (6 and 4 over Charl Schwartzel and Hideki Matsuyama) and Four-ball (3 and 2 over Branden Grace and Louis Oosthuizen).
Lowry elected to turn professional the week after his Irish Open triumph, meaning that he would miss out on the opportunity to play in the Walker Cup in September 2009.[11] He made his professional début on 28 May at the European Open, where he shot 78 in the first round to end the opening day almost at the back of the field, and went on to miss the cut following a second round 73.[12]
World Golf Championships-Accenture Match Play Championship: In his fourth consecutive start at the World Golf Championships-Accenture Match Play Championship, fought his way to the semifinals Sunday morning against Ernie Els. Got off to a hot start, leading for seven of the first nine holes. With a shift of momentum, Els battled back and won three consecutive holes (Nos. 10-12) to gain a 2-up lead. Following an eagle and par on Nos. 13 and 14, he squared up the match. An Els birdie-3 at No. 18 sent the match to extra holes. A birdie-3 at the 19th hole (No. 1) gave him the upset win over Els.
On June 3, 2018, DeChambeau won the Memorial Tournament in Dublin, Ohio, in a sudden-death playoff against Kyle Stanley and An Byeong-hun, after the three finished regulation play tied at −15. After Stanley bogeyed the first hole of sudden death, DeChambeau then proceeded to win with a birdie on the second hole, giving him his second win on the tour.[16]
DeChambeau made his PGA Tour debut as an amateur in June 2015 at the FedEx St. Jude Classic near Memphis, Tennessee, and finished in 45th place. He played in his first major championship at the U.S. Open at Chambers Bay, but missed the cut by four strokes.[4] DeChambeau was unable to defend his NCAA title in 2016 after the SMU athletic department was handed a postseason ban by the NCAA.[5] He decided to forgo his senior season to play in a number of events before turning professional.[6] At the 2015 Australian Masters in November, DeChambeau was runner-up with John Senden and Andrew Evans, two shots behind the winner Peter Senior.[7] He was the low amateur at the Masters in 2016 and tied for 21st place.[8]
Waste Management Phoenix Open: Won fifth PGA TOUR title at the Waste Management Phoenix Open in his 220th career start at the age of 30 years, 1 month, 21 days. Began the final round with a four-shot lead and won by two strokes after recording a double bogey and triple bogey en route to a closing 3-over 74. Became the first player since 1983 to win with both a double bogey and triple bogey or worse in the final round. Triple bogey came at No. 11 at TPC Scottsdale after he chipped his ball into the water and received an additional penalty when the ball rolled back into the water after he had placed it back into play. Marked the second time of seven occasions he converted a 54-hole lead to victory.

On 23 November 2011, Lowry was again loaned out to play in the Championship, this time to Millwall until 3 January 2012. He followed Aston Villa team-mate Nathan Baker who also signed on loan for Millwall two days earlier.[19] Lowry made his Millwall debut three days later, where he played 90 minutes, in a 0–0 draw against Crystal Palace.[20] His impressive display at Millwall soon earned a loan extension.[21] Weeks later on 13 January 2012, Lowry was sent-off in the 22nd minutes after stamping on Nikola Žigić, which saw Millwall lose 6–0.[22] Three years on after signing for Birmingham City, Lowry stated, quoting: "Whatever club I play for I fully commit to that club at the time. I play with my heart on my sleeve. Sometimes in the past I have gone overboard but I was a younger player then, I have learned a lot from these types of experiences. But I am an aggressive player, that’s the way I like to play and I can’t change the way I play. I will use my experience now and be a bit more clever."'[23]
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