Lap Times In 800 WRs Since The First Sub-1:50
Since Tom Hampson of Britain ran history's first sub-1:50 in the 800 at the '32 Olympics, only twice in the progression of the fastest time ever (not necessarily the official World Record) has the mark been made with a second lap faster than the first. Those were by Jim Ryun and Dave Wottle.

Going backwards, the best-time progression, with lap splits and differential (+ = converted from 880-yard time):

1:41.01    David Rudisha        48.9/52.1        +3.2

1:41.09    David Rudisha        49.1/52.0        +2.9


1:41.11    Wilson Kipketer    49.3/51.8        +2.5

1:41.24    Kipketer            48.3/52.9        +4.6

1:41.73    Kipketer            49.6/52.1        +2.5

1:41.73    Seb Coe            49.7/52.0        +2.3

1:42.33    Coe                50.6/51.7        +1.1

1:43.44    Alberto Juantorena    51.4/52.0        +0.6

1:43.50    Juantorena        50.9/52.6        +1.7

1:43.5+    Rick Wohlhuter        50.7/52.8        +2.1

1:43.7    Marcello Fiasconaro    51.2/52.5        +1.3

1:44.0+    Wohlhuter        51.7/52.3        +0.6

1:44.3    Dave Wottle        52.9/51.4        -1.5

1:44.40    Ralph Doubell        51.2/53.2        +2.0

1:44.3+    Jim Ryun            53.0/51.3        -1.7

1:44.3    Peter Snell        50.6/53.7        +2.9

1:45.7    Roger Moens        52.6/53.3        +0.7

1:46.6    Rudolf Harbig        52.8/53.8        +1.0

1:48.4    Sydney Wooderson    52.3/56.1        +3.8

1:49.0+    Elroy Robinson    53.2/55.8        +2.6

1:49.1    Ben Eastman        53.7/55.4        +1.7

1:49.8    Tom Hampson        54.8/54.9        +0.1