On Saturday, league leaders Boca Juniors will host second-placed Argentinos Juniors at La Bombonera.
Maradona, 59, took charge of Gimnasia in September when they were last in the standings with just one draw from five matches. The 1986 World Cup winner has led the team to three wins and a draw in their past seven matches.
In Friday's only other Superliga fixture, Defensa drew 1-1 away to defending champions Racing Club.
The result left Maradona's outfit 22nd in the 24-team standings with three wins, two draws and 10 losses. Banfield remained 17th, six points above Gimnasia.
Eric Ramirez put Gimnasia ahead from close range in the 13th minute but the visitors suffered a double blow shortly after Nelson Insfran brought down Reinaldo Lenis, earning the goalkeeper a second yellow card.
Jesus Datolo tucked away the resultant spot-kick but the hosts failed to capitalize on their extra player as Gimnasia held on to secure a point.
BUENOS AIRES, Nov. 29 (Xinhua) -- Diego Maradona's Gimnasia La Plata earned a 1-1 draw at Banfield in the Argentinian Superliga on Friday despite playing for more than an hour with just 10 men.