Table:
text: Billy Casper
Senior PGA Tour wins (9)
Senior PGA Tour wins (9)
Date_ Tournament Winning_score Margin_of_victory Runners_up
Jun 12, 1988 Mazda Senior Tournament Players Championship –10 (69-68-74-67=278) 2 strokes Al Geiberger
Oct 22, 1989 Transamerica Senior Golf Championship –9 (69-70-68=207) 3 strokes Al Geiberger

Question: Who were the runners-up when the winning score was -10 (69-68-74-67=278) for Billy Casper's senior PGA Tour wins (9)?