FACTBOX: Biggest one-day slides for major U.S. indexes

NEW YORK (Reuters) - U.S. stock index futures pointed to a sharp sell-off at the start of trading on Wall Street on Tuesday.

Some indications, such as the 531 point drop in futures on the Dow and 67 point drop in the S&P 500 futures as of 7:30 a.m. (1230 GMT), suggest the day ahead may rank among the biggest declines in Wall Street history.

Below is a snapshot of the five largest daily declines, in both percentage and net index point terms, for the Dow Jones industrial average, Standard & Poor's 500 index and Nasdaq Composite index.

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DOW: PCT CHANGE POINT CHANGE

10/19/87 22.6 PCT 09/17/01 684.81

10/28/29 12.8 PCT 04/14/00 617.78

10/29/29 11.7 PCT 10/27/97 554.26

11/06/29 9.9 PCT 08/31/98 512.61

08/12/32 8.4 PCT 10/19/87 508.00

S&P 500: PCT CHANGE POINT CHANGE

10/19/87 20.5 PCT 04/14/00 83.95

03/18/35 10.1 PCT 08/31/98 69.86

04/16/35 10.0 PCT 10/27/97 64.85

09/03/46 9.9 PCT 10/19/87 57.86

10/18/37 9.3 PCT 1/04/00 55.80

NASDAQ: PCT CHANGE POINT CHANGE

10/19/87 11.4 PCT 04/14/00 355.49

04/14/00 9.7 PCT 04/03/00 349.15

10/20/87 9.0 PCT 04/12/00 286.27

10/26/87 9.0 PCT 04/10/00 258.25

08/31/98 8.6 PCT 01/04/00 229.46

Source: Reuters data/Stock Traders' Almanac (Reporting by Ellis Mnyandu, editing by Walker Simon)