The Nationals selected Hassell's contract from Triple-A Rochester on Tuesday, Mark Zuckerman of MASNSports.com reports.

The Nationals promoted Hassell from Double-A Harrisburg to Triple-A Rochester on Monday, Bobby Blanco of MASNSports.com reports.

Hassell was named the Eastern League Player of the Week on Monday, Jessica Camerato of MLB.com reports.

Hassell (groin) is listed among the Nationals prospects on the "Futures Roster" for Tuesday's exhibition against current Washington players, Mark Zuckerman of MASNSports.com reports.

Manager Dave Martinez said Wednesday that Hassell has been diagnosed with a strained groin, Andrew Golden of The Washington Post reports.

Nationals manager Dave Martinez said Hassell (groin) will undergo an MRI on Monday, Mark Zuckerman of MASNSports.com reports.

Manager Dave Martinez revealed Saturday that Hassell is day-to-day with groin tightness, Bobby Blanco of MASNSports.com reports.

Hassell went 2-for-3 with a triple and a run scored in Saturday's Grapefruit League game against the Astros.

Hassell will play in the Arizona Fall League this October, Jonathan Mayo and Sam Dykstra of MLB.com report.

Hassell is hitting .227 with three home runs, nine steals and a 32.2 percent strikeout rate in 52 games for Double-A Harrisburg.