Arsenal striker Olivier Giroud headed a late winner as the Gunners ended a run of two Premier League defeats with victory over a stubborn West Brom to climb back to third. Giroud was making his first league start of the season and looped in an 86th minute header from a Mesut Ozil cross for his goal. Until that moment the Gunners had enjoyed nearly 80% possession, but had struggled to find a way past inspired Baggies keeper Ben Foster. He pulled off a number of key stops, including a double save when he parried an Alex Iwobi shot and blocked the rebound at the feet of Alexis Sanchez.