Who did lesnar fight for the UFC title?

Brock Lesnar had a fairly short UFC Career. It spanned 7 fights and close to 4 years. He retired at the end of his last fight in December 2011 with a UFC win-loss record of 4 wins and 3 losses. He was also the "UFC Heavyweight" champion and defended it twice before losing it. His matches were with the following fighters:

a. Frank Mir (Lost)

b. Heath Herring (Won)

c. Randy Couture (Won the UFC Heavyweight Title)

d. Frank Mir (Defended the title)

e. Shane Carwin (Defended the title)

f. Cain Velasquez (Lost the Title)

g. Alistair Overeem (Lost the match and Retired)