Is it a persimmon?
Some type of squash?
Papaya? Sorry, probably not supposed to guess twice.
Hooray! Victory is mine...until I try to guess this tricky bugger....I'm going to go with grapefruit but I am not confident about this one at all.
I first wanted to say orange, but it doesn't look like there are those little individual teardrops that make up the flesh. So maybe pumpkin?