By May 21, Betts had amassed a major league-leading 15 home runs. He led MLB in batting average, slugging percentage, OPS, total bases, extra-base hits, doubles, runs scored, runs created, and OPS+. He led Boston with 11 stolen bases, good for third in MLB. His 3. 8 WAR (as calculated by Baseball-Reference. com) at that point was second only to Trout in the majors. His offensive success was a major factor in the Red Sox’ 32–15 start. On June 1, Betts was placed on the 10-day disabled list, retroactive to May 29, with a left abdominal strain; he returned to the active roster on June 11.  On July 6, Betts hit his 22nd home run of the season, the 100th of his MLB career.  He became the fourth Red Sox player to hit 100 home runs before turning 26, the others being Tony Conigliaro, Jim Rice, and Ted Williams.  On July 8, while batting . 343 with 22 home runs and 44 RBIs, Betts was named to the 2018 MLB All-Star Game as an American League starting outfielder.  In a game against the Toronto Blue Jays on August 9, he hit for the cycle, becoming the 21st player in Red Sox franchise history to accomplish the feat.  On September 26, Betts stole his 30th base of the season, becoming just the second player in Red Sox history to join the 30–30 club (the first was Jacoby Ellsbury in 2011).