I'm doing a special one for today
9/1/23 - Cubs lead the Reds 2-1 in the bottom of the 9th, lose 3-2
9/2/23 - Cubs lead the Reds 1-0 in the bottom of the 9th, lose 2-1
9/16/23 - Cubs lead the Diamondbacks 4-3 in the bottom of the 10th, 5-4 bottom 11th, and 6-5 bottom 13th, lose 7-6 in 13 innings
9/26/23 - Cubs lead the Braves 6-5 in the bottom of the 8th, lose 7-6
9/27/23 - Cubs lead the Braves 3-2 in the bottom of the 8th, 4-3 bottom 9, 5-4 bottom 10, lose 6-4 in 10 innings
3/28/24 - Cubs lead the Rangers 3-2 in the bottom of the 9th, lose 4-3 in 10 innings
4/8/24 - Cubs lead the Padres 8-7 in the bottom of the 8th, lose 9-8
4/16/24 - Cubs lead the Diamondbacks 11-10 in the bottom of the 9th, lose 12-11 in 10 innings
4/20/24 - Cubs lead the Marlins 2-1 in the top of the 9th, lose 3-2
5/2/24 - Cubs lead the Mets 6-5 in the bottom of the 11th, lose 7-6
5/3/24 - Cubs lead the Brewers 1-0 in the top of the 8th, lose 3-1
The Cubs have had the lead in the 8th inning or later in 41 of their last 61 games. However they are just 30-31 in those 61 games.