Libertad had to come from behind to draw 1-1 at 10-man Sol de America but they were not made to pay for failing to claim a sixth straight win, as their closest rivals Nacional Asuncion and Guarani had already missed out on victories on Saturday.
Sol struck early thanks to Ignacio Mino's header but were pegged back 10 minutes before half-time when Libertad's leading marksman Rodrigo Lopez converted a penalty.
Lopez's 10th league goal of the season was enough for Libertad to move to 20 points in the Apertura campaign, maintaining their four-point lead on Nacional Asuncion, who have a game in hand.
A long goal-kick led to Sol's opener in Asuncion with the home side playing just six passes to get the ball from one end to the other before Mino headed into the net from six yards.
But Sol's hopes of victory were dealt a severe blow in the 35th minute as defender Aureliano Torres was red-carded for blocking Lopez's shot on the line with his hand, before the visitors' Uruguayan striker slotted the penalty.
Libertad dominated possession (66 per cent) and finished the match with 16 shots to Sol's six but were unable to find a winning goal.
