A tennis doubles court has an overall size of 36 feet wide by 78 feet long. The continuous line forming the boundary of the court then measures 228 feet ([36 feet + 78 feet]*[2]).
1 mile is equivalent to 5,280 feet.
Thus, following the line of the court, you'll need to run 23 times to cover [(5280/228)] the 1 mile distance.
The singles court is slightly narrower measuring 27 feet wide. Both singles and doubles courts share the same length.
So when using a singles court:
[27 feet + 78 feet]*[2]) = 210 feet
5,280 feet / 210 feet = 25.14 times around the court.
Tip: Outsideonline.com shares 5 Steps to Running Your Fastest Mile.