The Reds on Thursday completed a two-step commitment to their top starting pitchers by signing All-Star right-hander Bronson Arroyo to a two-year contract extension through 2010 with a club option for 2011. Coupled with the signing of Aaron Harang, who agreed to a four-year, $36.5 million deal on Tuesday, the Reds assured themselves of having the right-handed duo in their rotation for at least the next four seasons and possibly five. Arroyo's deal is worth at least $25 million in new money. The club option would bring the total to $33.07 million, including the possible buyout.