For tennis courts near GWB, there appears to be only nearby bridges over tracks, with the best entry point at 165th & Riverside.
For tennis courts near CU, best entry point is near 120th and Riverside.
http://maps.google.com/maps?f=q&hl=en&q=W+165th+St+%26+Riverside+Dr,+New+York,+NY+10032&ie=UTF8&om=1&z=19&ll=40.847148,-73.945726&spn=0.001781,0.004227&t=h
http://maps.google.com/maps?f=q&hl=en&q=W+120th+Street+%26+Riverside+Dr,+New+York,+NY&ie=UTF8&z=18&ll=40.81132,-73.96394&spn=0.003557,0.00685&t=h&om=1
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