I've always heard that the leadoff walk scores 70% of the time, and according to the chart, a run scores 55.5% of the time in that scenario, so that's pretty close. Actually, per Table 1 of the above, the leadoff batter who walks scores 40% of the time. According to table 3, ZERO runs are score 56.6% of the time after a leadoff walk, which means that 1 or more runs is scored 43.4% of the time. Either number isn't very close to 70%. Table 3 agrees with Tangotider's run frequency table I pasted into the "SABR FAQ" thread that's pinned (page 2). It includes all the base/out states (0 outs, runners at 1, 0 outs, runners at 1 and 2, etc...). I find that thing absolutely invaluable. For instance, much has been made of the Brewers inability to: 1. Score a lead off double. 2. Score a runenr at third with 1 out. Looking at tango's run frequency table (again, table 3 above has about the same values) you can see that a leadoff double results in atleast 1 run 73% of the time (average of 1.1 runs are scored). A runner at third and 1 out results in atleast 1 run 66% of the time (average of .9 runs). While both are high, 1 in 4 leadoff doubles don't score and 1 in three runners at third w/1 out don't score. It's interesting to compare how often a a leadoff runner who singles/walks scores himself vs. how often that situation results in a 1 run. The lead off batter himself scores 40% of the time, while 1 or more runs is scored about 43% of the time overall. 3% of the time where an inning starts with a runner at 1st and 0 outs, atleast 1 run is scored, but not by the runner at first. I would assume 2.9% of the time the leadoff runner is forced out by the next batter, who eventually scores himself. Nice thread.