By Giuseppe Muro

Theo Walcott believes Arsenal showed their true colours at Upton Park on Saturday.

Walcott set up Robin van Persie’s opener, scored himself and then won a penalty for the third as Arsenal ended a frustrating week with an emphatic 3-0 win over West Ham.

After uncharacteristic displays against Leeds and Ipswich, an efficient, clinical Arsenal made amends as their London rivals were brushed aside. That was much more like it, admits Walcott.

"That [was] not the Arsenal we know in the last couple of games,” said the forward. "This was the real Arsenal though.

"In the last two matches, mentally we weren't right. But that’s out of the way now, in the past. No disrespect to Leeds and Ipswich and their ranking, but we should be getting better results.

"In recent years we've come here [to Upton Park] and been bullied off the ball. Last year we went 2-0 up and they came back to 2-2 so it's always a tough place [to come to]. But we pressed them well and the bobbly pitch turned out OK.”

Next up for Walcott and his side is an FA Cup Third-Round replay against Leeds on Wednesday and the 21-year-old wants to take momentum into the game at Elland Road.

"We're always going to score goals and it was important to get that clean sheet which we did and everyone was solid and we're grateful for the win.

"Leeds got a good result against Scunthorpe so it's going to be tough. I scored my first goal for Southampton at Elland Road so I'm looking forward to the battle.”

Copyright 2014 The Arsenal Football Club plc. Permission to use quotations from this article is granted subject to appropriate credit being given to www.arsenal.com as the source 17 Jan 2011