SuperSport United fought back to hold Bloemfontein Celtic to a 1-1 draw in the 2020 MTN8 semi-final first-leg match which was played at Lucas Moripe Stadium on Sunday afternoon.
Siwelele took the lead through Ndumiso Mabena in the first half, but his strike was cancelled out by Ghampani Lungu's goal after the restart.
Matsatsantsa were wounded after succumbing to a 3-1 defeat to Lamontville Golden Arrows in a PSL clash in midweek which was their first defeat of the season.
Coach Kaitano Tembo named an offensive-minded team with strikers Iqraam Rayners, Thamsanqa Gabuza and Bradley Grobler deployed in attack ahead of playmaker Ghampani Lungu.
While Phunya Sele Sele were also coming off their maiden defeat of the season having suffered a 1-0 loss to Swallows FC in a league clash on Wednesday.
Ndumiso Mabena made his first appearance of the campaign for coach John Maduka's side and the Celtic captain, who had recovered from an injury, was partnered with Victor Letsoalo upfront.
SuperSport dominated possession in the opening exchanges, but they looked vulnerable at the back whenever they lost the ball and they were punished by Mabena.
The hosts lost possession in midfield and Letsoalo quickly sent Mabena through on goal and the former Orlando Pirates striker made no mistake as he scored to make it 1-0 to Celtic in the 14th minute.
Matsatsantsa tried to respond with a goal, but Bradley Grobler placed his volleyed effort over the crossbar without troubling Jackson Mabokgwane in the visitors' goal-posts.
Celtic's two frontmen Letsoalo and Mabena were able to penetrate the hosts' defence with ease with the experienced duo of Bongani Khumalo and Clayton Daniels struggling to contain them.
Letsoalo had two good goalscoring opportunities, but he was brilliantly denied by SuperSport keeper Ronwen Williams twice with Tembo's side living dangerously at the back.
Celtic were deservedly leading 1-0 at the interval with Mabena having netted an important away goal for the Free State giants.
The Tshwane giants came back fired up following their half-time team talk with their Zimbabwean tactician Tembo and they managed to level matters through Lungu.
The Zambia international scored from close range to make it 1-1 in the 50th minute after his initial shot was blocked on the goal-line with the Celtic defence in sixes and sevens.
Phunya Sele Sele then suffered a blow as Mabokgwane went down injured and the former Bafana Bafana international was replaced by Sipho Chaine.
The momentum was with SuperSport in the closing stages of the match with Tembo having introduced attackers Moses Waiswa and Evans Rusike.
However, the Siwelele defence was solid and compact and the hosts resorted to long-range shots with Waiswa and Teboho Mokoena both missing the target from outside the box.
Ultimately, the match ended in a 1-1 draw and Celtic are set to host SuperSport in the second-leg clash at Dr Molemela Stadium on Saturday, November 7.
The winner on aggregate will take on either Orlando Pirates or Kaizer Chiefs in the final with the former having secured a 3-0 win in the first-leg encounter at home on Saturday.