Yesterday's announced attendance of 34,789 was a Nationals Park record for a non-Opening-Day Monday and third-best overall Monday attendance ever, trailing the 2010 and 2009 home openers (41,290 and 40,386 respectively - both against Phillies of course). Previous record for a non-Opening-Day Monday was 28,552 on Memorial Day 2008 (26th May) vs Brewers.
Yesterday ranked 22nd overall in Nats Park attendance:
41,985 Thursday 25th June 2009 vs Red Sox
41,530 Wednesday 24th June 2009 vs Red Sox
41,517 Tuesday 23rd June 2009 vs Red Sox
41,290 Monday 5th April 2010 vs Phillies [season/home opener; highest of 2010]
40,386 Monday 13th April 2009 vs Phillies [home opener]
40,325 Friday 18th June 2010 vs White Sox [Strasburg start]
40,315 Tuesday 8th June 2010 vs Pirates [Strasburg debut]
40,043 Tuesday 27th July 2010 vs Braves [Strasburg start]
39,824 Sunday 29th June 2008 vs Orioles [highest attendance of 2008]
39,479 Saturday 28th June 2008 vs Orioles
39,434 Sunday 30th March 2008 vs Braves [season/home opener, ballpark debut]
39,214 Saturday 3rd July 2010 vs Mets [Strasburg start]
39,055 Thursday 31st March 2011 vs Braves [season/home opener]
38,049 Saturday 31st July 2010 vs Phillies
36,487 Saturday 19th June 2010 vs White Sox
36,014 Saturday 18th July 2009 vs Cubs
35,830 Friday 27th June 2008 vs Orioles
35,807 Sunday 1st August 2010 vs Phillies
35,567 Sunday 25th May 2008 vs Brewers
35,188 Saturday 26th April 2008 vs Cubs
35,154 Friday 25th April 2008 vs Cubs
34,789 Monday 30th May 2011 vs Phillies [Memorial Day]