Players who are designated as a all-rounder often bat in the middle order (e.g., Garfield Sobers usually batted at number 6; by contrast, W. G. Grace always opened the innings). wicket-keepers generally bat in the middle order as well, often at number 6 or 7 (e.g. Adam Gilchrist throughout his Test career usually batted at number 7; however he predominantly opened the batting in limited-overs cricket). One reason for placing all-rounders and wicket-keepers in the middle-order even though they may be more skilled than those who batted above them was because such players would be tired after bowling or keeping wicket during the preceding innings. Another reason, with the trend of wicket-keepers opening the innings in limited-over cricket, batsmen at positions 6, 7 and 8 tend to be at the crease when the second new ball is due, so they can function just like an opener and know how to wear out the new ball, or play aggressively to score quick runs to chase victory or to build the innings quickly towards a declaration. It is also plausible to see substitute wicket-keepers batting at number 5 or 6.