Fiers went 11-8 with a 4.48 ERA in 31 games (30 starts) for the Astros last year, allowing 187 hits and striking out 134 in 168 2/3 innings. He'll compete for a spot in the rotation this year with newcomer Charlie Morton, Joe Musgrove and Brad Peacock.
Gonzalez is asking for $4.2 million, and the Astros filed for $3.25 million; Harris is seeking $2.3 million, and the team filed for $1.95 million; and McHugh is asking for $3.85 million, and the team filed for $3.35 million.
If the players and the teams can't come to terms by the end of the month, they will head to a hearing in which a three-person arbitration panel will side with either the player or the team to determine a salary in 2017.