On May 15, 2015, Arihara made his NPB debut. He won the Pacific League Rookie of the Year after pitching to an 8–8 record with 102 strikeouts.[3][4] Arihara won the Japan Series in the 2016 season, and was also a NPB All-Star after he posted a 2.94 ERA and 11–9 record in 22 appearances.
In 2017, Arihara registered a 10–13 record and 4.74 ERA in 25 appearances. In 20 games in 2018, Arihara pitched to a 8–5 record and a 4.55 ERA with 87 strikeouts. In 2019, Arihara led the NPB in wins, with 15, and was named an All-Star for the second time in his career. In 2020, Arihara recorded an 8–9 record and 3.46 ERA in 20 games.
After the 2020 season, on November 26, 2020, the Fighters announced they were allowing Arihara to enter the posting system to play in Major League Baseball (MLB).[5]
Texas Rangers
On December 26, 2020, Arihara signed a two-year contract worth $6.2million[6] with the Texas Rangers of MLB.[7][8] On April 3, 2021, Arihara made his MLB debut as the starting pitcher against the Kansas City Royals, allowing three earned runs in five innings of work with one strikeout. On May 22, it was revealed that Arihara had a posterior humeral circumflex artery aneurysm in his right shoulder, which required surgery, ruling him out for at least 12 weeks.[9] On May 26, he was placed on the 60-day injured list.[10] On September 1, Arihara was activated from the injured list. On September 19, Arihara was designated for assignment by the Rangers.[11]
Arihara had his contract selected back to the major league roster on August 16, 2022. In a September 10 start against the Toronto Blue Jays, Arihara was clobbered for 11 earned runs on 12 hits and five walks over three innings pitched.[12] The next day, Arihara was designated for assignment, with a cumulative 9.45 ERA in five games. He cleared waivers and was sent outright to the Triple–A Round Rock Express on September 14.[13] Arihara elected free agency following the season on November 6.[14]
In 2024, Arihara had a 14–7 record and a 2.36 ERA with 137 strikeouts in 182+2⁄3 innings pitched across 26 appearances. He started Game 1 of the 2024 Japan Series.[18]
Arihara made 26 appearances for Fukuoka in 2025, compiling a 14-9 record and 3.03 ERA with 121 strikeouts over 175 innings of work. With the Hawks, Arihara won the 2025 Japan Series.[19]
He became a free agent at the end of the season.
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