Going by DATE it's 6th worst (Actually tied for 4th. Or you could break the tie by looking at game finish time, LOL). Going by MATCH it's tied for 8th worst.
Jesus freaking Christ. Look at the list again. There were
five times when the Nationals notched their tenth win at a
later point in the season,
by match.
That means there were five starts to the season that were WORSE, by match. That means that this is the sixth worst start, by match.
You have it completely backwards: it's actually the eighth
best start by match, as in there were 7 starts that were better.