The Killer's Game - Jay R Bonansinga

An action-packed thrill ride about a legendary hit man faced with a terminal diagnosis who takes out a hit on himself, only to find that he's been misdiagnosed just when an army of talented assassins are coming for him.
Joe Flood is the professional assassin known as “the Slugger.” He’s made a career out of murder for hire, but only those who deserve it.
Then a routine physical turns into a reckoning. Joe has cancer, his doctor tells him, with maybe six months to live.
Joe decides to take fate into his own hands. Accessing the underground network of fellow hit men, he puts out a contract on himself: six million dollars from a Swiss bank account to the professional who will end his suffering quickly. The money and bragging rights for putting away one of the world’s most accomplished assassins draws his colleagues from around the world. The killer’s game is on.
But then Joe gets a follow-up from his doctors. He was misdiagnosed. It’s not cancer; he should have many years to live. Except that now there’s no way to call off the hit.
Armed with only a few dollars and a credit card, Joe is on the run from a formidable lineup of talented killers. Will the Slugger have what it takes to outrun the competition