Johann Ech also sucessful defeated Luther in debates as
well...
Wikipedia:
A mutual desire for a public disputation led to a compact between
Eck and Luther by which the former pledged himself to meet
Karlstadt in debate at Erfurt or Leipzig, on condition that Luther
abstain from all participation in the discussion. In December 1518,
Eck published the twelve theses which he was prepared to uphold
against Karlstadt, but since they were aimed at Luther rather than
at the ostensible opponent, Luther addressed an open letter to
Karlstadt, in which he declared himself ready to meet Eck in
debate.
The disputation between Eck and Karlstadt began at Leipzig on 27
June 1519. In the first four sessions Eck maintained the thesis
that free will is the active agent in the creation of good works,
but he was compelled by his opponent to modify his position so as
to concede that the grace of God and free will work in harmony
toward the common end. Karlstadt then proceeded to prove that good
works are to be ascribed to the agency of God alone, whereupon Eck
yielded so far as to admit that free will is passive in the
beginning of conversion, although he maintained that in course of
time it enters into its rights; so that while the entirety of good
works originates in God, their accomplishment is not entirely the
work of God.
Despite the fact that Eck was thus virtually forced to
abandon his position, he succeeded, through his good memory and his
dialectic skill, in confusing the heavy-witted Karlstadt and
carried off the nominal victory. He was far less
successful against Luther, who, as Eck himself confessed, was his
superior in memory, acumen, and learning. After a
disputation on the absolute supremacy of the papacy, purgatory,
penance, etc., lasting twenty-three days (4 July27 July), the
arbitrators declined to give a verdict, but the general impression
was that victory rested with Eck. He did succeed in making Luther
admit that there was some truth in the Hussite opinions and declare
himself against the pope, but this success only embittered his
animosity against his opponents, and from that time his whole
efforts were devoted to Luther's overthrow. Eck was greeted as
victor by the theologians of the University of Leipzig,
who overwhelmed him with honors and sent him away with gifts.
In addition to his inquisitorial duties, every year witnessed the
publication of one or more writings against iconoclasm and in
defense of the doctrines of the Mass, purgatory, and auricular
confession. His Enchiridion locorum communium adversus Lutherum et
alios hostes ecclesiae (Landshut, 1525) went through forty-six
editions before 1576. As its title indicates, it was directed
primarily against Melanchthon's Loci Communes, although it also
concerned itself to some extent with the teachings of Huldrych
Zwingli.
At Baden-in-Aargau from May 21 until June 18, 1526 a public
disputation on the doctrine of transubstantiation was held, in
which Eck and Thomas Murner were pitted against Johann
Oecolampadius. The affair ended decidedly in favor of Eck, who
induced the authorities to enter on a course of active persecution
of Zwingli and his followers (Conference of Baden).
The effect of his victory at Baden was dissipated, however, at the
Disputation of Bern (January 152
, where the propositions advanced by the Reformers were
debated in the absence of Eck, and Bern, Basel, and other places
were definitely won for the Reformation. At the Diet of Augsburg
(1530) Eck played the leading part among the Roman Catholic
theologians.
