In the Cavaliers' season opener on October 17, 2017, Love scored 15 points in a 102–99 win over the Boston Celtics. He hit a critical 3-pointer with 46.3 seconds left to put Cleveland up 102–98. On November 7, 2017, he had a then season-best game with 32 points and 16 rebounds in a 124–119 win over the Milwaukee Bucks. On November 28, 2017, he scored 32 of his 38 points in the first half of the Cavaliers' 108–97 win over the Miami Heat. He scored 22 points in the first quarter and finished 10 of 16 from the field and 14 of 17 on free throws. On December 25, 2017, he had a game-high 31 points and a season-best 18 rebounds in a 99–92 loss to the Golden State Warriors. On January 30, 2018, Love left the Cavaliers' game against the Detroit Pistons with a fracture in his left hand. He missed six weeks and 21 games with the injury, returning to action on March 19 against the Bucks. He scored 18 points in 25 minutes in a 124–117 win. Two days later, he recorded 23 points and 12 rebounds in a 132–129 win over the Toronto Raptors. He knocked down his 1,000th career 3-pointer during the game. On April 1, 2018, he recorded his 400th career double-double with 13 points and 13 rebounds in a 98–87 win over the Dallas Mavericks. In Game 2 of the Cavaliers' second-round playoff series against the Raptors, Love had his best game of the postseason with 31 points and 11 rebounds in a 128–110 win, helping Cleveland take a 2–0 lead in the series. Love missed matching his career playoff high by one point. In Game 4 against Toronto, Love scored 23 points in a 128–93 series-clinching win. During the game, Love became the fourth player in Cleveland history with 500 career playoff rebounds, joining LeBron James, Tristan Thompson and Zydrunas Ilgauskas. In Game 1 of the NBA Finals, Love recorded 21 points and 13 rebounds in a 124–114 overtime loss to the Warriors. The Cavaliers went on to lose the series in four games.