The move 5.f3 is an interesting one and worth a try for two reasons:
- Avoiding heavy theory.
- Tricking some Najdorf or Dragon players who are not keen to play the Maroczy bind with c4.
However, Black has a few ways to respond. One response seems very tricky by directly exploiting the weakness created by f3 (and avoiding the Maroczy bind).
[FEN ""]
1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.f3 e5 6.Nb3 a5!? 7.c4? (7.Bb5 {is better}) Nxe4! 8.fxe4 Qh4+ 9.Kd2 a4 {and Black wins back the piece with some advantage}
Black seems to be fine by playing e5 and d5, without pushing further to d4 as played recently by Giri, Nakamura, Areshchenko.
[fen ""]
1. e4 c5 2. Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.f3 e5 6. Nb3 d5 7.Bg5 Be6 8.Bxf6 gxf6 9.exd5 Qxd5 10.Qxd5 Bxd5 {and the pair of bishops offsets the pawn weaknesses.}
Update: If following the good arguments of @Scounged, Black is not afraid to enter the Maroczy bind, there is a favorable version. Black plays 5...Nc6 and if White continues by 6.c4 Black replies with 6...Qb6 disrupting White's play, followed by g6. Here is an illustrative game:
[fen ""]
[title "D'Amore, Carlo (2456) vs. Sutovsky, Emil (2664), EU-chT, 2001"]
1. e4 c5 2. Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.f3 Nc6 6.c4 Qb6 7.Nc2 g6 8.Nc3 Bg7 9.Qd3 (9.Rb1 {is probably more promising for White but there is a fun variation} 9...Ng4!? 10.Qd2! (10.fxg4 Bxc3) Bxc3 11. Qxc3 Qf2 12.Kd1 O-O) 9...Nd7 10.Nd5 Qd8 11.Be2 Nc5 12.Qa3 f5! 13.exf5? (13.O-O) Bxf5 14.Nde3 Qb6 15.Nxf5 gxf5 16.Rb1 Nd4 17.Nxd4 Bxd4 18.Be3 Ne6 19.Bxd4 Nxd4 20.Qa4+ Kf7 21.c5 Qxc5 22.Qc4+ Qxc4 23.Bxc4+ Kf6 24.Kf2 Rac8 25.Bd3 e5 26.g4 fxg4 27.fxg4 d5 28.Rbd1 h5 29.g5+ Kxg5 30.Rhg1+ Kf4 31.Rg7 Rhf8 32.Bg6 Kg5+ 0-1