SAN DIEGO, JULY 11 -- Jack McKeon resigned as manager of the San Diego Padres to turn his attention to the front office and the National League club today named coach Greg Riddoch to replace him.

McKeon, who recently said he'd bow out as manager at season's end or sooner, remains with the Padres as vice president of baseball operations, a post he has held since 1980.

"I just felt two jobs was too much. I was really getting burdened," he said today of his double duty since 1988.

"I know the club has been an underachieving club. We expected a great deal out of the players. Maybe it's my fault. I take full responsiblity.

"It's just a case where I was wore out. I didn't have the time to devote to both jobs. I was cheating the organization. I was cheating myself."

Riddoch, 44, in his fourth year with the Padres and third season as their first-base coach, will be managing in the major leagues for the first time. He previously had managerial jobs in the Cincinnati farm system. The Reds had signed him as a player out of Northern Colorado University; he went on to graduate.

"I have signed a new contract through the end of the year," Riddoch said. "I'm the manager, not an interim manager. I'm going to make it as hard as I can for them to get rid of me."

Riddoch got right into his job when he said that batting coach Amos Otis was fired and two new coaches would be joining the team. He declined to name them.

The Padres are struggling at 37-43, having lost 12 of 15 games before the all-star break. They start the second half of the season fourth in the NL West, 13 1/2 games behind the first-place Reds.

McKeon managed them to second place at 89-73 with a strong second half last season. His major league managing record at Kansas City, Oakland and San Diego is 479-474.