Cape Town - Per Mertesacker has hailed Danny Welbeck's performance against Manchester United that helped send Arsenal into the FA Cup semi-finals.
The England forward made the switch to north London last summer and scored the Gunners' second goal on his return to Old Trafford.
Mertesacker was also impressed with the way the 24-year-old led the line in front of more than 9,000 travelling fans.