One that competes
By this time a competitor had entered the field.
He was thrice a successful competitor for the prizes of the Academy of Sciences of Paris.
Very soon the Asahi had a keen competitor in the Osaka Mainichi Shimbun (Osaka Daily News) and these papers ultimately crushed all rivals in Osaka.
In agricultural machinery Germany is a serious competitor with England.
Euler, assisted by his eldest son Johann Albert, was a competitor for these prizes, and obtained both.