Trevor Story homered twice for Colorado after Corey Kluber left his Texas debut with shoulder tightness, and the Rockies beat the Rangers 5-2 on Sunday.
Kluber, who was acquired in an offseason trade with Cleveland, lasted just one inning and 18 pitches in his first start in almost 15 months. The two-time Cy Young Award winner was knocked out of his last start for the Indians on May 1, 2019, after his right forearm was broken by a comeback liner.
Finally back on the mound after his comeback attempt last year ended with an oblique injury in a rehab start, the 34-year-old Kluber struck out David Dahl to start the game. He walked Story and retired Charlie Blackmon on a popup after Story was thrown out trying to steal.
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The Rangers said Kluber reported feeling the tightness in the first few pitches and it got worse as the inning progressed. He was examined by a team doctor and will be further evaluated Monday.
Texas slugger Joey Gallo hit the first home run in the club's new $1.2 billion retractable-roof stadium, a 437-foot shot that almost struck a truck dealer's "Hit it Here" sign just inside the right-field foul pole.
Story, a Dallas-area native who grew up watching the Rangers across the street at the ballpark still visible through the huge windows in left field at Globe Life Field, belted a tying two-run shot in the fourth. The opposite-field drive into the first row in right came off left-hander Joe Palumbo (0-1), who replaced Kluber.
After Ryan McMahon's go-ahead sacrifice fly later in the fourth, Story drove a solo shot into the second deck in left field for a 4-2 lead in the sixth as the Rockies rallied to win the season-opening series after dropping the opener. Colorado lost its last 12 road series last season.
Colorado left-hander Kyle Freeland (1-0), who lost eight of his last nine decisions while finishing 3-11 last season, gave up two runs and four hits in six innings.
Yency Almonte struck out three in two scoreless innings, and Wade Davis pitched a perfect ninth for his second save in as many days after going a year between saves.
Rockies: RHP Scott Oberg (lower back strain) will throw a bullpen session Monday in Denver. Manager Bud Black said it was doubtful Oberg would be ready for the home opener July 31 against San Diego.
Rangers: Utilityman Isiah Kiner-Falefa, expected to be somewhat of a regular at third base, was out of the lineup for the second straight day with left hamstring tightness. Manager Chris Woodward said he hoped Kiner-Falefa would be ready after Monday's off day.
Both teams return Tuesday. Colorado RHP Antonio Senzatela (11-11, 6.71 ERA in 2019) is set to start in Oakland. RHP Kyle Gibson is set for his Texas debut as the Rangers' stadium-opening series continues against Arizona.