Ok...forums first MOTD (match of the day) flopped in the first minutes...lets try one more time.
Juan Martin del Potro is much taller than Federer, has won vs Federer 5 times and he has his own support team with him from Argentine.
Federer and Potro have met before. A total of WHOPPING 21 times!
Federer won 16 times and Potro 5!
Potro Won Federer already back in Us Open 2009. Last time he won Federer was in 2013 Swiss indoors basel tournament 6-4 6-7 (5) 7-6 (3). After that match they have met 3 times, twice more in 2013 where Federer won 6-3 4-6 6-3 at Paris Paribas Master and Federer won vs Potro in barclays ATP World Tour FInald London 4-6 7-6(2) 7-5.
This year 2017 they have met once at Miami Open 27.3.2017 where Federer won 6-3 6-4
Maybe this will be the match of the day (or night) !