Salary/Winnings: $4.5m Endorsements: $28.5m Things haven't been easy for Rafa Nadal over the last couple of years, as his struggles with injury have really started to impact on his success on a tennis court, with 2015 the first year he failed to win a Grand Slam since his first success back in 2005. While his earnings from tournaments may be down - *just* $4.5m - he continues to be an extremely bankable star for global brands, including big sponsorship deals with the likes of Kia Motors and Nike.