His outstanding series was against Australia in 1966–67, when he scored 606 runs in seven innings, including three centuries, took 24 catches as wicketkeeper and conceded only six byes.

Denis Lindsay made his first-class debut at the age of 19 for North-Eastern Transvaal in the "B" Section of the Currie Cup in the 1958–59 season.

Playing against Orange Free State at Benoni he batted at number five and kept wickets, hitting his team's highest score, 43, in a narrow defeat in a low-scoring match.

In 1961 he was selected with 12 other promising young players to tour England as the South African Fezela XI under the captaincy of Roy McLean.

[3] After solid performances with the bat and behind the stumps for North-Eastern Transvaal, Lindsay was selected to tour Australia and New Zealand in 1963–64.

[4] Lindsay played his first Test four weeks later, batting as a specialist batsman at number five (John Waite kept wicket) and making 17 in his only innings.

In South Africa's only Test victory on the tour, he scored 41 in his only innings, took four catches, and conceded only one bye.

He took four catches and a stumping and conceded one bye again when South Africa won the Second Test, though he scored only 0 and 9.

In this important game Lindsay hit 30 and 68 to help the home team to an easy victory and raise the South Africans' confidence leading into the Test series.

[11] In the First Test in Johannesburg, Peter van der Merwe won the toss and batted, but South Africa quickly lost five wickets for 41 before Lindsay came in.

Lindsay added 81 with Lance, then 221 with van der Merwe; aided by numerous dropped catches, he hit 182 off 227 balls with 25 fours and five sixes.

Following on, South Africa lost four wickets for 60 before Lindsay, with his head bandaged, made 81 off 134 balls, adding 119 with Lance to help the team reach 367.

Lindsay then took three catches in each innings as Australia made 147 and 334, and South Africa hit the winning runs for the loss of only two wickets.

[17][18] Lindsay was also the only batsman to score a century in the Fourth Test in Johannesburg, when rain saved Australia from almost certain defeat.

South Africa declared at 322 for 9 and reduced Australia to 148 for 8, still 31 runs in arrears, before rain ended the match.

[19][20] With the series still in the balance in the Fifth Test in Port Elizabeth, Australia was sent in by van der Merwe and dismissed for 173, Lindsay taking two catches.