Mikel Arteta praised Viktor Gyokeres after he scored a second-half brace in Arsenal’s 3-0 win against Sunderland.Following Martin Zubimendi’s impressive first-half opener at the Emirates Stadium, Gyokeres landed his first just six minutes after coming on as a substitute.The Sweden international then completed his brace in stoppage time to put the gloss on a win which moved Arteta’s side nine points clear of Manchester City at the top of the Premier League.