Sept 17 (Reuters) - World rankings on Tuesday (U.S. unless stated, last week's positions in brackets): 1. (1) Tiger Woods 13.65 average points 2. (2) Adam Scott (Australia) 9.23 3. (3) Phil Mickelson 8.47 4. (4) Rory McIlroy (Northern Ireland) 7.68 5. (5) Justin Rose (England) 7.67 6. (6) Henrik Stenson (Sweden) 7.12 7. (7) Matt Kuchar 6.68 8. (8) Brandt Sn