The Diamondbacks optioned Walston to Triple-A Reno on Wednesday.
The Diamondbacks activated Gallen (elbow) from the 60-day injured list Wednesday.
Walston (1-0) earned the win Tuesday against the Royals after allowing one unearned run while walking three and striking out two over two innings in relief.
Burnes didn't factor into the decision Tuesday against the Royals after allowing two hits and two walks while striking out two over three scoreless innings.
Carroll will be held out of the lineup again Wednesday in Kansas City and is scheduled to undergo imaging on his lower back Thursday when the Diamondbacks return home, Nick Piecoro of the Arizona Republic reports.
Jansen went 2-for-4 with a home run and four RBI in Tuesday's 10-5 win over the Mariners.
Lopez started at second base ans went 3-for-3 with an RBI and a run scored in Tuesday's 10-5 win over Seattle.
Jung (calf) went 2-for-5 with a double and an RBI for Triple-A Round Rock on Tuesday.
Nelson (elbow) struck out two and hit a batter over a scoreless inning for Triple-A Reno on Tuesday.
Tawa started in right field and went 3-for-5 with a home run and two RBI in a 5-3 extra-innings win over the Royals.
The Rangers have hit their stride as they've won five games in a row, with four of those five games getting over the total. The Ranger bats have come alive, hitting .293 the last two weeks, and that's without Corey Seager, who's on the 10-day IL. They were the best under team in baseball, hitting over 60% but over the last month, they've dipped to 55.2% to the under. They're playing playoff-style baseball, which is exactly what the Diamondbacks are also doing, winning four of their last five at Milwaukee and at Los Angeles. They're two games under .500 and looking like a playoff team despite all the trades they made at the trade deadline. Lookout, Patrick Corbin. Just the over.
It's now official...look out for the Rangers! Wins in five straight and eight of nine have put them back into the AL wild card mix after their sweep of the A's in Sacramento on the weekend. As for Monday starter Patrick Corbin, he's off of his best start of the season, allowing three hits, walking only one and striking out eight while shutting out the Angels thru 8 innings last Tuesday. Granted, some better form lately, too, for the D-backs, though Monday starter Ryne Nelson has if off of a very so-so August in which he posted a 4.60 ERA< and Arizona has lost four of his last six starts. Play Rangers on Money Line
