#4 Record against top 10 opposition
Federer (224) has the most top 10 wins in the history of men's tennis. During the 2000s, Federer racked up 118 top 10 wins and endured 53 losses for a 69% win-loss record against top 10 opposition.
During the 2010s, Federer had 106 top 10 wins and 64 losses against the elite group for a win-loss % of 62%.
Winner: Federer of the 2000s
#5 Match points saved in wins vs Match points squandered in losses
During his career, Federer has squandered match points in 22 matches en route to losses - most notably in the 2010-11 US Open semifinals and the 2019 Wimbledon final against Novak Djokovic. On the other hand, he has saved match points in 20 matches en route to wins.
In the 2000s, the numbers were 7 match points squandered in losses and 11 match points saved in wins. The corresponding numbers in the 2010s were 15 match points squandered and 9 match points saved in losses and wins respectively.
WINNER: Federer of the 2000s
Conclusion
Federer of the 2000s was undoubtedly the stronger and more ruthless performer than the one in the 2010s, as evidenced by the superior numbers in all categories bar one. However, Federer of the 2010s wasn't as much of a laggard as may be incorrectly assumed at first glance without delving deeper into the numbers.
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