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Robert Lewandowski, right, and Kylian Mbappe are two of the best attacking players around, but who else is at the top of Europe's xG charts? Gisela Schober/Getty Images

Every team needs a top goal scorer, but who are the other players most likely to score in Europe's top league?

Most people are familiar with the metric expected goals. A variety of shot type, shot position, goalkeeper position, chance type, assist type and pressure on the ball are some of the contextual factors used to calculate xG.

What's the final result? Adding up a player's expected goals can show us how many goals a player should have scored on average.

A player with an xG of 10 and 11 goals has exceeded expectations. The average success rate in football is 0.77, so for this data we will only show non-penalty goals.

His 35 goals in 34 games last season put him on top of the xG charts across the major domestic league competition in Europe.

A man who is 10 years older than Lewandowski is next. The 19-year-old, who came close to joining Real Madrid for nothing this summer before signing a new contract with Paris Saint-Germain, had 28 goals and 17 assists in 35 games in the French league.

Which other attacking players had the highest xG number last season?

The transfer grades for Man United are an F.

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Goals, goals, goals

RankPlayerTeamAgexGGamesMinsNP GoalAstShotSOG
1R. LewandowskiBayern3331.28342,95130315676
2K. MbappePSG2323.88353,029241714363
3S. HallerAjax2820.48312,5791979840
4M. SalahLiverpool3019.91352,761181313354
5A. ModesteCologne3418.48322,61419310643
6S. ManeLiverpool3018.39342,8241629839
7L. OpendaVitesse2217.87373,04617311951
8L. MartinezInter2417.6352,30118311248
9D. JotaLiverpool2517.37352,3721549033
10P. SchickLeverkusen2617.09272,0932338843
11C. NkunkuRB Leipzig2416.94342,73519138139
12T. AbrahamRoma2416.84373,0971449236
13K. BenzemaReal Madrid3416.74322,600201211749
14H. KaneTottenham2816.6373,23213912951
15V. PavlidisAZ2316.57372,8531859539
16M. DembeleLyon2616.52302,2091648340
17L. DiazLiverpool2516.12312,46518710038
18C. ImmobileLazio3216.05312,71620210950
19H-M. SonTottenham3016.01353,0192378649
20C. RonaldoMan Utd3715.92312,48915310840

The leader of the way is Lewandowski. The Poland international scored all but two of his goals from inside the box in the Bundesliga last season.

His 156 shots are the most of any player in this list. That's a pretty good percentage.

Some of the usual suspects are on the list as well. There were 19 non-penalty goals from 98 shots for the new signing.

Anthony Modeste, who is 34 years old, scored five goals for FC Cologne last season, while Lois Openda, who is 22 years old, scored four goals for Vitesse.

Christopher Nkunku is the only player in the top 20 who could be considered more of a central figure than a goal scorer. His xG of 16.94 is better than the 19 non-penalty goals he scored last season.

The player has scored more difficult goals if the xG number is low and the goal number is high. Son Heung- Min scored 23 goals for Spurs.

Lionel Messi's 6 non-penalty goals from 89 shots last season at Paris Saint-Germain came at an xG of 11.38.

The next generation

RankPlayerTeamAgexGGamesMinsNP GoalAstShotSOG
1K. MbappePSG2323.88353,029241714363
2L. OpendaVitesse2217.87373,04617311951
3V. PavlidisAZ2316.57372,8531859539
4D. NunezBenfica2315.48281,9872248139
5D. VlahovicJuventus2214.52362,93819311347
6Vinicius JrReal Madrid2213.88352,69917108043
7J. BurkardtMainz 052213.81342,6321037834
8V. OsimhenNapoli2313.78271,9891429130
9E. HaalandDortmund2113.74241,9141677431
11J. DavidLille2212.98382,8071306730
12T. DouvikasUtrecht2212.03362,511737531
13J. LarsenGroningen2211.22322,3431426034
14R. Kolo MuaniNantes2311.09362,9541245427
15Z. FlemmingFortuna2310.83282,4961249641
16G. ScamaccaSassuolo2310.7362,1541507836
17R. LeaoMilan2310.58342,6181189738
18P. FodenMan City2210.37282,133955722
19B. SakaArsenal2010.18382,991979529
20S. LinoGil Vicente229.93342,9631158334

The world-class attacker from Paris Saint-Germain, Kylian Mbappe, is already among the top players in the world, but which other young players made an impact in front of goal last season?

The Dutch Eredivisie has a star performer in the form of the aforementioned Openda. 18 non-penalty goals came at an xG of 16.77.

We can see why the Reds spent a lot of money to sign Darwin. He scored 22 goals last season, which was more than he was expected to do.

Man City's new 60m acquisition Erling Haaland had 16 Non-Penalty Goals from 74 shots at an XG of 13.94 during an injury-hit season.

If clubs are looking for a player who won't cost the same as these big names and is still likely to score with regularity, they would do worse than look at the rest of the top 20.