#1 Luis Suarez (Barcelona)

The definition for an unscrupulous player isn't limited to a player who just makes rash tackles and receives a bunch of bookings. Make no mistake, any sportsman who resorts to deceit and unethical means to gain advantage during a match also makes that category.
There can't be a better example than Luis Suarez, of how cheating tarnishes the beauty of football.
A doff of the hat to the Uruguayan's sharpshooting skills in front of goal, but he still needs to work on his behaviour while on the pitch.
Suarez has always been surrounded by well documented controversies which have resulted in considerably long bans. He was found abusing Patrice Evra racially, followed by certain biting incidents involving Branislav Ivanovic and Giorgio Chiellini.
Of course, he has moved on from biting, but there are other concerns to think about. The striker has used diving many times to get advantages, Barcelona's famous comeback against PSG is probably the best example of his antics.
He resorted to a dive in the penalty box for which the Catalans were awarded a penalty, a major factor that changed the course of that game.
Recently, he was also seen lashing a kick at Alaves defender Ruben Duarte out of spite in a La Liga game in January.
In another scenario, he used a ploy to get booked deliberately against Girona. Had he been booked then, it would have meant a one-game suspension as it would have been his fifth yellow card. He would have missed the next clash against Las Palmas and returned for a crucial game against Atletico Madrid, had he been booked.
These are enough instances to show Suarez needs to reevaluate himself in the behavioural department.