Someone who competes with one or more other people(noun)
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Use "contender" in a sentence
"Another title contender, Fernando Alonso, had his title hopes thwarted by his inability to pass Vitaly Petrov."
"They're just not the type of franchise players a team can build a title contender around."
"But Tony Stewart proved Monday that everybody is a title contender when, days after crossing himself off a list of viable threats to win the championship, he snapped a 32-race winless streak with his victory at Chicago."