ARLINGTON (AP) – The Rangers are sending struggling rookie outfielder Michael Choice to Triple-A Round Rock and preparing to use their 12th starting pitcher this season.

Choice, who had a .177 average with eight homers, was demoted and infielder Donnie Murphy was designated for assignment Monday.

The Rangers brought up right-handed reliever Roman Mendez and outfielder Jake Smolinski from Round Rock, and both had a chance for their major-league debut in the series opener against Houston.

Rookie right-hander Nick Martinez was scratched from Tuesday’s start because of discomfort in his back. He will be replaced by right-hander Phil Irwin, who made his only big-league appearance in a start for Pittsburgh last year.

The Rangers have 10 days to trade, release or outright Murphy to the minor leagues. He was hitting .196.

(© Copyright 2014 The Associated Press. All Rights Reserved. This material may not be published, broadcast, rewritten or redistributed.)

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