Looking up...
She was the top contender in the race.
She was the leading competitor in the race.
A person or thing competing with others for a prize, position, or recognition.
He entered the tournament as a strong contender.
He joined the tournament as a serious competitor.
The new smartphone is a serious contender in the market.
The new phone competes strongly with other models.
Often paired with adjectives like 'top', 'strong', or 'serious' to indicate the level of competition.