As celebrated by Phillysucks:
""The Phillies are closing in on being the first professional team to reach 10,000 losses all time.
Below is the Phillies all time record.
Wins: 8808 Losses: 9999
Current as of 7/8/07
Initial stats prior to 2005 compiled from baseball-reference.com. 2005 season to present, record is updated daily.
Note: There is some conflicting information out there. The Phillies website includes the records from the Worcester Brown Stockings (1880-1882) which would make the Phillies 7-1 loss to the Boston Red Sox on June 25, 2005 the 10,000th loss."
Who knows whether we have already reached or just one loss away? I'll operate on the assumption that we have yet to reachb this milestone.