International Career -

Waugh made his first-class debut for New South Wales (NSW) in 1984–85, batting at number nine and bowling medium pace. In the Sheffield Shield final that season, he scored 71 while batting with the tail to help NSW to victory. After ten first-class matches for NSW, he made his Test debut against India in the 1985–86 season, in the Second Test at Melbourne. He scored 13 and 5 and took 2/36 in the first innings. Failing to make a substantial score in the series (he tallied 26 runs in four innings), Waugh was retained for the subsequent tour of New Zealand. He had a good all-round match in the Second Test at Christchurch, making 74 and claiming 4/56, but his batting average was only 17.40 for the series, scoring 86 runs. Waugh had more success in the one-day format during the season. He made his debut against New Zealand at the MCG and took 1/13 and a catch. He did not bat as the match was washed out. He was retained for all of Australia's 12 matches in the triangular tournament, scoring 266 runs at 38.00 with two half-centuries, including a top score of 81 in the Australia Day victory over India. He took seven wickets at 33.00. Waugh was retained for all four ODIs on the tour of New Zealand, scoring 111 runs at 27.75 and taking four wickets at 39.75. The Australian selectors persisted with Waugh, and he toured India in 1986, despite having scored only 113 runs at 12.56 in his Test career. During the three Tests, Waugh had limited opportunities and scored 59 runs for once out and took two wickets. At this stage of his career, Waugh bore a heavy workload as a bowler although he was ostensibly selected for his batting. He played in all six ODIs on tour, scoring 111 runs at 55.50 and taking seven wickets at 35.86.

                                                 
He bowled a long spell, taking 3/76, in the First Test against England at Brisbane in 1986–87, then scored 0 and 28 as Australia slumped to defeat. In the Second Test at Perth he made 71 and had match figures of 5/159 including 5/69 in the second innings, then he scored 79 not out in the drawn Third Test at Adelaide. Scores of 49 and 73 in the last two Tests, gave him series figures of 310 runs (at 44.29) and ten wickets (at 33.60), a fighting effort in a team defeated 1–2. The win in the Fifth Test was the first time that Waugh was in a victorious Test team, in his 13th match. Waugh played in all of Australia's 13 ODIs for the home season, scoring 372 runs at 37.20 with two half-centuries and taking 21 wickets at 21.80. Waugh regularly performed with both bat and ball. In a match against Pakistan, he scored 82 and then took 4/48 but could not stop the visitors taking a one-wicket victory from the second last ball. He then scored 83* and took 2/30 in an Australia Day victory on England. He was unable to maintain his form in the finals, scoring one and one and taking a total of 1/78 as England won 2–0. Early in his international career, Waugh was a natural, uninhibited strokeplayer who liked to drive off the back foot. He could score quickly, but was inconsistent at Test level and seemed better suited to ODI cricket. In the shorter game, he often accelerated the scoring in the later overs of the innings. As a bowler, he employed a carefully disguised slower ball bowled from the back of the hand, and regularly sent down the final overs, when this change of pace was difficult to score from.

                                       

1987 World Cup-

The 1987 World Cup, played on the Indian subcontinent, was the turning point of Waugh's career. Having scored 19* in the death overs against India in the first match, Waugh's tight bowling in the closing overs finished with his dismissal of Maninder Singh in the final over, which secured a one-run victory. In the following match against Zimbabwe, Waugh scored 45 before conceding only seven runs in six overs of bowling as the Australians won by 96 runs. In the following match against New Zealand, Waugh bowled the last over with the Kiwis requiring seven runs for victory: he restricted them to only three runs by taking three wickets in the over. He ended with 2/36, as one of the last over wickets was a run out.

In the second round robin rotation, Waugh took 1/59 and scored 42 in a 56-run loss to India, before taking 2/37 in a 17-run win over New Zealand. In Australia's final group match, Waugh scored 10* before taking 1/9 from four overs in a 70-run win over Zimbabwe. Australia qualified for the semi-finals and faced co-hosts Pakistan on their home soil in Lahore. Batting first, Waugh hit 16 from the final over of the innings in a cameo of 32*, a match that Australia won by 18 runs. In the final, he scored an unbeaten five in a brief innings at the end of the innings. He was a key player as Australia defended a target of 254 against England at Kolkata. He claimed the wickets of Allan Lamb and Phillip DeFreitas in the 47th and 49th overs as England stumbled towards the end of the run-chase. Australia won by seven runs to claim the World Cup for the first time. Waugh compiled 167 runs at 55.66 and took 11 wickets at 26.18. These performances in tight situations earned him the nickname of "Iceman".