MARS' RETURN TRIP: Bruno Mars becomes the sixth solo male in the Billboard Hot 100's 52-year history to send his first two radio singles as a lead act to No. 1, as "Grenade" ignites 2-1.

Mars first topped the Hot 100 as a lead artist with "Just the Way You Are" for four weeks in October.

He had arrived as a featured singer on B.o.B's "Nothin' On You," which spent two weeks at No. 1 in May, and Travie McCoy's "Billionaire," which reached No. 4 in June.

Here is a look at the select six lead male artists to storm the Hot 100's top spot with their first two radio tracks:

Andy Gibb (the only member of the exclusive club to reign with his first three chart entries)
"I Just Want to Be Your Everything," four weeks, 1977
"(Love Is) Thicker Than Water," two weeks, 1977
"Shadow Dancing," seven weeks, 1977

Lionel Richie
"Endless Love" (Lionel Richie & Diana Ross), nine weeks, 1981
"Truly," two weeks, 1981

Peter Cetera
"Glory of Love," two weeks, 1986
"The Next Time I Fall" (with Amy Grant), one week, 1986

Rick Astley
"Never Gonna Give You Up," two weeks, 1988
"Together Forever," one week, 1988

Diddy
"Can't Nobody Hold Me Down" (Puff Daddy featuring Mase), six weeks, 1997
"I'll Be Missing You" (Puff Daddy & Faith Evans featuring 112), 11 weeks, 1997

Bruno Mars
"Just the Way You Are," four weeks, 2010
"Grenade," one week to-date, 2010

Of the six artists, two first famously built their Hot 100 resumes as lead singers of iconic groups. Richie charted 19 titles, including two No. 1s, with the Commodores from 1974 to 1982. Cetera made 19 Hot 100 appearances with Chicago, also notching two No. 1s, between 1969 and 1985.