Chelsea experienced what could prove to be one of their most comfortable games of the season on Saturday, as Jose Mourinho's side strolled to a 2-0 win against 10-man West Bromwich at Stamford Bridge.
First-half goals from Diego Costa and Eden Hazard sealed three points for the Blues, before the Baggies were reduced to 10 men as Claudio Yacob received his marching orders just before the half-hour mark.
On his return to full fitness, Costa proved a menacing throughout the entirety of his involvement. The Spaniard grabbed an early opener for the Blues to take his tally to 11 for the season, although he might have overhauled leading goalscorer Sergio Aguero, had he been more fortunate in front of goal.
Having managed four attempts in total, three of which hit the target, he will probably feel that he should have had a hat-trick.
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Costa has proven himself as a masterpoacher since his Premier League arrival, with each of his goals coming from within the penalty area - most within the six-yard box, in fact.
His finish against the Baggies proved no different. Here, he chested down the ball before volleying past Ben Foster to set the ball rolling for the league leaders.
The former Atletico looked sharp and free of injury, with his movement off the ball causing problems all afternoon.
Costa's link-up play with the Blues' star-studded midfield is exceptional and one witnessed this in action against the Baggies. The Spaniard instinctively looks to hold-up the ball, or play backwards, in order to maintain possession.
He recorded an impressive pass completion rate of 85% in this match, having attempted 20 passes. He made 11 passes in the final third, while 40% of his passes saw possession move back towards his own half. It must be said, he wasn't his usual creative self, as he failed to set-up a single chance for his team-mates.
Costa found himself substituted with eight minutes to play, as Mourinho opted to give Didier Drogba a run-out. This concluded an assertive performance from the Spaniard, although, on another day he probably would have scored more goals.