With this win, he entered the Official World Golf Ranking as an amateur at No. 168 and reached a career high of sixth in the World Amateur Golf Ranking. Walker Cup captain Colin Dagleish described the win as "fairytale stuff", adding: "You'd have to say that Shane's victory was the biggest (of the three amateur wins). To win your own national Open is quite something. It was unbelievable, it really was." The win was only the second home victory since 1982 and the first since Pádraig Harrington in 2007. Harrington himself was also full of praise: "It's fabulous for Irish golf. You only have to look at the fact it is such a rarity for an amateur to win, such a rarity for an Irish player to win the Irish Open. So, on a lot of fronts, it is a big deal. It was very impressive."
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.
On July 16, 2017, DeChambeau earned his first PGA Tour victory by winning the John Deere Classic by a single stroke over Patrick Rodgers. He carded a round of 65 in the final round to win his maiden title in his 40th start on tour. The win coming the week before, gained DeChambeau a place in the 2017 Open Championship, where he missed the cut after rounds of 76–77 (+13).