Reynolds, who spent most of last season in Triple-A, is hitting .381 in 42 spring training at-bats, making the decision tough for manager Terry Collins.
"He's a baseball player -- everybody keeps saying that about him, but that's what he is," Collins said. "He handles the bat, he runs the bases, he does a lot of little things right. But Danny Muno's a dangerous bat -- I'll tell you what, he can get a hit. And the other kid, Ruben, he's played there. He's played there under the bright lights and been very successful. So we've got a lot of options."
Murphy is still recovering from a hamstring injury and is uncertain for Opening Day.
Kang had two hits on the game and brought a smile to manager Clint Hurdle's face, reports MLB.com.
"A very, very good day at the plate for him," Hurdle said of Kang. "He stayed on a breaking ball and lined out hard, singled sharply to center, then got all of that fastball. Nothing can breed confidence like success."
Kang was just 2 for 29 coming into Sunday during spring training.
Descalso missed two weeks while recovering from an oblique strain. He's expected to open the season as the team's primary utility infielder.
"I think if anything, this spring has given me confidence," Tulowitzki said. "When I was diagnosed with a torn labrum last summer, you think about a lot of things. You think about your career and whether or not you'll be the same player. You check out how you feel, day in and day out. I know it's just spring training, but for me, I've gained a lot of confidence. I know I can be the same player, if not better."
Tulowitzki was in the midst of his finest offensive season last year before undergoing hip surgery and being limited to 91 games. He finished with a .340/.432/.603 line with 21 home runs and 52 RBI in 315 at-bats.
Arcia, who has played mostly in minor-league camp this spring, ripped two doubles Friday in three innings of work. He's gone 4 of 7 at the plate in limited spring training work.
"He's impressive," manager Ron Roenicke said Saturday. "He's got the total package. The offense is what they were hoping would come around. This is a short sample, obviously, but if he continues to grow in that direction he will be fun to watch."