The forward was brought on 10 minutes into the second half in a game devoid of clear opportunities and opened the scoring with a shot from distance which was helped into the net by fumbling Russia goalkeeper Igor Akinfeev.
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"I've been waiting for this World Cup for so long but I'd never thought I would even score," he enthused to reporters. "I think I was lucky but it wasn't a bad start from me.
"To be frank, I never thought it would go in because I shot it straight at the keeper but, during the warm-up, my efforts on goal weren't bad so I just went for it and I was lucky."
The 29-year-old feels that his side could have done better on Tuesday after Aleksandr Kerzhakov levelled in the closing stages to share the points but is confident that their performances will improve in the games to come.
"[Tuesday]'s result was a bit disappointing but I think we played as well as we had expected to," he argued.
"Hopefully we'll be in a higher gear when we play Algeria and will be able to get ourselves a better result because of it."