With spring training less than a month away, there are not that many battles on the loaded Astros roster. If you are a starting pitcher outside of the top five pitchers, good luck. If you play one of the infield spots, better luck next year. After winning the World Series, there are not likely going to be any surprise players on the 25-man roster.
One of the positions that could fluctuate a little this year is left field. Several players will get playing time out there, including right fielder Josh Reddick. George Springer will be the primary centerfielder but will play right field from time to time.