PHOENIX -- With his team searching for bullpen help as the postseason approaches, Los Angeles Dodgers rookie Roki Sasaki pitched a scoreless inning in relief in his return Wednesday night against the Arizona Diamondbacks .

Sasaki, who was activated from the 60-day injured list before the game, looked impressive in a 1-2-3 inning. He struck out two, including Ildemaro Vargas swinging on a 99 mph fastball, and departed with the Dodgers leading 3-1.

The right-hander is expected to continue to throw out of the bullpen over the final four games of the regular season to see if he can earn a postseason role.

Manager Dave Roberts said he doesn't have a specific role for Sasaki but wanted him to take advantage of his opportunities.

"Giving everything he has for an inning or two at a tim

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