Among philosophers, Karl Popper was one of Freud's most notable contemporary opponents.

Saddler fought many other notable opponents during his career.

His next notable opponent, Tyrone Crawley, defeated him by a ten round decision.

Reymann was also a notable opponent of the destruction of Berlin's bridges.

While serving as DA, he became a notable opponent of capital punishment.

He played two doubles finals against Bob and Mike Bryan, as his most notable opponents.

Moore was also a notable opponent of a proposed amendment to the Alabama constitution in 2004.

Satyamurti is one of the notable opponents of the movement to abolish the Devadasi system.

He has boxed outside of the USA on two occasions, both times against his most notable opponents to date.