When you make a saving throw, you roll a d20 and succeed if you roll a target number or higher; in this case, the target number is 10.
Or, when you make a saving throw, you roll a d20 and add an ability modifier for the type of save you are expected to make, against a target number set by the person who was attacking you. Which is how every other saving throw is defined in the game. And in which case Death Saving Throw doesn't match.
We can split hairs as fine as you'd like so that both of us could claim we were right. Which is exactly my point on the word 'hit' too. There's no absolutes in either case. It all comes down to Rulings, rather than Rules and no "obvious" answers. ;-)