To Eric Hosmer, however, it's a chance to prove he belongs in the big leagues, and in Saturday's 10-inning, 5-4 win over the Rays, he strengthened his case, going 3-for-5, scoring two runs and driving in the game-winner.
In the 4th inning, Hosmer tied the game at 2-2 when he raced around the bases from first on Mike Moustakas' double to center. Hosmer scored again in the 6th, singling, advancing to third and coming home on a sac fly to get the Royals within one, at 4-3.
The big moment came in the 10th, after KC had tied the game, when Hosmer doubled home the winning run as pinch runner Mike Aviles motered home from first.
Hosmer has credentials for rookie of the year, toting a .277 batting average with nine homers and 40 RBI... and his second walk-off hit of the season.
Upton went 3-for-5 with six RBI; Montero was 2-for-4 with five ribbies.
The win helped Arizona stay within range of the NL West-leading Giants at four games out. San Fran beat Milwaukee, 4-2, on Saturday. The Diamondbacks also trail Altanta by five games in the wild card race.
STREAKS: Florida Marlins third baseman Emilio Bonifacio went 2-or-4, extending his career-best hitting streak to 22 games, as the Marlins downed the Mets, 8-5. Seattle equalled the franchise record for futility, losing their 14th straight, as Boston downed the Mariners, 3-1.