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When it comes to scoring goals Lewandowski has always been good, he has always known to be a goal scoring machine. Lewandowski is a great player and it is possible that before the season end he will increase the amount of his goals. Lewandowski is one of the reasons of Barcelona victories in their games.
One of the reasons Lewandowski joined Barcelona was to break Benzema dominance in the list of top scorers, he managed to prove that even though he was already 34 years old. Lewandowski number of goals will increase if he is always fit, other support because Barcelona is in top form this season. If Barcelona win La Liga and Lewandowski holds top scorer status, he will be one of the luckiest players this season.
Both players have almost the same age: they are both veteran for what we consider the ideal age to play professional football. But remember that Pelé was still able to play like a real master in his fifties.
This is because of a mix of talent and luck, for sure. And when we see this combination, we cannot be sure whether it will finish soon or all the statistics will be broken.