Bayonne climbed off the foot of the Top 14 table on Sunday, courtesy of a battling 16-13 victory over Toulouse at Stade Jean Dauger.
Toulouse led 10-0 after 21 minutes, but a Julien Jane try and four successful kicks from Manu Saubusse turned the tide in favour of the hosts.
Saubusse's third penalty, on 46 minutes, ultimately proved decisive, although Bayonne almost saw their slender lead wiped out in the closing seconds.
Visiting replacement Samuel Marques mustered the required accuracy with a long-range three-point attempt, but his kick did not reach the posts and Bayonne were therefore able to celebrate a second straight win that lifts them above Grenoble.
Sunday's other fixture saw Stade Francais edge out Montpellier 21-17, despite being outscored two tries to none.
Seven penalties from Jules Plisson earned a deserved win for Stade, who were generally in the ascendancy either side of Joe Tomane and Timoci Nagusa crossing in the space of five second-half minutes.
Stade climb two places to 10th, while their beaten opponents remain fourth.