I didn't pay attention before, but the default google earth image of the island is 2/5/17. the tennis court is not even there any more
Here's a rough timeline of the hilltop where the tennis court was. I drew a box for reference to help me get the same general area in each screen cap
2/12/04: Hilltop is mostly vegetated
11/29/06: hilltop is cleared of vegetation, trees/brush are in several piles
8/13/09: trucks, looks like possible dirt work going on
2/12/13: small white square-shaped structure at top of the hill. Looks like it is on a gray gravel pad, but there are 4 brown patches around it. Almost looks like a cross-hair
7/28/13: small white structure still there
3/13/14: structure gone, dirt work going on
12/31/14: tennis court visible
2/5/17: This is the default view of the island on Google Earth (probably b/c it is the sharpest)
1/6/18: Half of tennis court is bare soil, white lines still visible on other half of court (was this a natural grass court?)
3/11/18: tennis court now completely gone, looks gray (possibly gravel?) rest of hilltop is brown (vegetation dormant)
12/5/18: grass/other vegetation has completely taken over court
4/12/19: court is brown again as vegetation has gone dormant