By Mark Gleeson LONDON (Reuters) -Australia took control of the World Test Championship final on Thursday as they stretched their lead over South Africa to 106 runs at tea on the second day after captain Pat Cummins had taken six wickets.

Lungi Ngidi (3-35) was the chief destroyer after a quiet first innings, claiming the prized scalp of Steve Smith (13), Beau Webster (9) and Aussie skipper Cummins (6) amid a potentially match-defining nine-over spell post-tea.

Australia captain Pat Cummins became the eighth from his country to 300 Test wickets as his 6 for 28, the best figures by a Test captain at Lord's, dismantled South Africa on the second day of the World Test Championship (WTC) final.

Steve Smith led an Australia fightback to put the defending champions on 190-5 at tea on the opening day of the World Test Championship final against South Africa at Lord’s on Wednesday. Smith scored

Former Australia opener Matthew Hayden highlighted Pat Cummins' pivotal role in restricting South Africa in the World Test Championship (WTC) final at Lord's, saying the Aussie skipper does everything right and lauded the right-arm pacer for completing 300 Test wickets despite not playing the format for over five years after his debut.

Test-capped players Nathan McSweeney, Matthew Renshaw and Kurtis Patterson are the biggest names in a 16-player 'A' squad picked to face Sri Lanka A in three one-dayers and a pair of first-class matches in July.

South Africa fought back at the start of the second day of the World Test Championship final against Australia but had captain Temba Bavuma dismissed before going to lunch on 121-5, still trailing by 91 runs.