The Russia star has been frustrated by the way the Gunners have thrown away leads against West Ham United and AZ Alkmaar in recent weeks, but was been buoyed by the way Tottenham Hotspur were dispatched on Saturday afternoon.
"We had a good game from start to finish," he said. "I think the first goal was the turning point.
"In the second half, when we made it 3-0, we could see the game out.
"What I liked in this game is that at half-time were sure we could end as winners. We were not nervous. There was a sense that the opponents couldn't equalise and that we wouldn't lose our lead."