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Single-Handedly 

All alone; without any assistance.

Saying that one could beat an opponent single-handedly is not the same thing as saying that he/she could do it 'with one hand tied behind his/her back'. That saying means that the upcoming fight or task will be very easy.
Sal (a guy) carried everyone's bags up the hill single-handedly.

Single-hander 

Someone who has had sex with between one and five people, i.e. they can count their sexual partners on a single hand.
If I had your luck, I'd still be a single-hander.
Single-hander by SFMG November 13, 2012