MLB Player News

Vientos (undisclosed) was scratched from Sunday's lineup against the Mariners, Anthony DiComo of MLB.com reports.

Vientos was originally set to start at third base and bat eighth Sunday, but he's been scratched for an undisclosed reason. More information on his status will likely come in the near future, but in the meantime, Jose Iglesias will slide over to the hot corner while Ben Gamel enters the lineup in right field after some lineup shuffling.

Castro (shoulder) has slashed .245/.327/.327 with one home run in 13 games since being reinstated from Triple-A Lehigh Valley's 60-day injured list July 23.

Castro had been on the shelf since April 3 due to the left shoulder injury before he was cleared to rejoin Lehigh Valley after completing a three-game rehab assignment shortly after the All-Star break. The 25-year-old infielder retains a spot on the Phillies' 40-man roster, but he hasn't appeared in the majors all season, and a promotion to Philadelphia wouldn't seem to be imminent.

Walston (elbow) struck out five and allowed two hits and no walks over 3.2 innings in a rehab start for Triple-A Reno on Sunday.

According to Jesse Friedman of GoPHNX.com, manager Torey Lovullo said July 26 that the Diamondbacks were undecided on what Walston's role might look like upon the left-hander's return from the 15-day injured list, but Walston's usage Sunday implies that he'll be built back up as a starter. With Eduardo Rodriguez and Merrill Kelly both beating him back from the IL, the Diamondbacks don't have a rotation spot available for Walston at the moment, though the complexion of Arizona's pitching staff could change by the time Walston is ready for activation. Walston posted a 2.84 ERA and 11:9 K:BB across 12.2 innings in three outings (two starts) for Arizona before landing on the IL on June 6 with a left elbow strain.

Triple-A Louisville placed Hurtubise on its 7-day injured list Friday with an unspecified injury.

Hurtubise received his first taste of the big leagues in mid-May and stuck around with the Reds through June 21, when he was optioned to Louisville after going 0-for-14 over his final nine games with the big club. Since that time, Hurtubise turned in an underwhelming .215/.339/.290 slash line with one home run and eight stolen bases in 30 games with Louisville before succumbing to an injury.

The Cardinals activated O'Brien (forearm) from the 60-day injured list Sunday and optioned him to Triple-A Memphis.

O'Brien has been sidelined since he suffered a flexor strain Opening Day against the Dodgers, and he'll head to the minors now that he's healthy. The 29-year-old allowed two earned runs with a 5:4 K:BB over eight innings during his rehab assignment with Memphis.

The Phillies designated Nelson for assignment Sunday.

The right-hander has been at Triple-A Lehigh Valley since mid-April and has now lost his place on the 40-man roster. Nelson allowed two runs over 3.1 innings with the Phillies and posted an 8.35 ERA in 25 appearances at Triple-A.

The Phillies claimed Tyler off waivers from the Marlins on Sunday and optioned him to Triple-A Lehigh Valley.

The right-hander was designated for assignment by Miami on Friday, and Philadelphia scooped him up to bolster the organization's pitching depth. Tyler made eight appearances (seven starts) for the Marlins this year and posted a 5.40 ERA, 1.74 WHIP and 25:18 K:BB across 31.2 innings.

Young went 2-for-4 with a solo home run and an additional run scored Sunday against the Angels.

Young's eighth-inning homer off fellow rookie Jack Kochanowicz broke up a scoreless outing by the young righty. He followed that up with an infield single then later scored as the Nats made a last-ditch albeit futile effort at a comeback in the ninth. It was the 24th multi-hit effort for Young this season and raised his average to .250 with two homers, 24 RBI, 62 runs and 27 steals in 33 attempts across 340 at-bats.

The Diamondbacks designated Castellano for assignment Sunday, Alex Weiner of ArizonaSports.com reports.

The 26-year-old was optioned to Triple-A Reno on Thursday and has now lost his place on the 40-man roster. Castellanos posted a 5.23 ERA in seven outings for the Diamondbacks, and he could remain with Reno if he passes through waivers unclaimed.

Tena (thumb) had X-rays come back negative after leaving Sunday's game against the Angels and is dealing with a fingernail issue, Spencer Nusbaum of The Washington Post reports.

The 23-year-old made his second straight start at third base Sunday but exited during the fourth inning when he was struck in the right hand by a hard grounder. Tena has avoided a serious injury and should be considered day-to-day.