A hard-hitting hand-to-hand fighter! 

Put up your Dukes

At 3rd level, You ready yourself to either strike or block with your fists. You gain the Unarmed Fighting fighting style feat.

You can use a bonus action to raise your arms and block incoming damage. You gain temporary hit points from this ability equal to xd10 + your Fighter Level with x equaling your constitution modifier (minimum of 1). Temporary hit points gained this way stack with other temporary hit point sources other than itself.

Additionally, if you do not have any temporary hit points, all unarmed attacks you make are made with advantage.

On the Ropes

At 7th level, after you finish a long rest, you can choose one of your known weapon masteries to apply to your unarmed strikes until you complete your next long rest.

Additionally, when you score a critical hit with an unarmed strike, you triple the damage rather than doubling it.

Expert Guard

 At 10th level, When you have Temporary Hit Points, you gain resistance to Bludgeoning, Piercing, and Slashing Damage. 

Knockout Punch

At 15th level, When Activating your Action Surge ability, you can forgo gaining an extra action to land a devastating blow to your target. Make an unarmed strike attack. On a hit, it is a guaranteed critical hit. If the damage exceeds the target's Constitution score, they must make a Constitution Saving Throw equal to your Strength Score, or be knocked unconscious. The effected target can repeat the save at the end of their turn to end the effect. 

Master Striker

 At 18th level, When making an Unarmed Strike with Advantage, you can add up to 3 known Weapon Masteries to each attack.