'Becker won exactly 12 points on Lendl's serve and never had a break point, even with the Madison Square Garden crowd of 16,842 pleading with him to make a match of it.'
'He was too good all week. He finished the tournament having lost his serve once in five matches -- and that was in his opener. He never dropped a set and only in that first match against Andres Gomez did he face so much as a break point.'
'He was broken only once in winning all five matches and 13 sets in the Masters. Lendl lost only 60 points on serve, an average of 12 per match.'
www.nytimes.com
'Tonight, for the third straight match, he did not face a break point. He lost only eight points while serving, two of them on double faults.' - After beating Wilander in his SF
'They were soon joined by Lendl, who never faced a break point against Edberg and won the match when Edberg double faulted twice at 30-all in the final game.' - After beating Edberg in his 3rd RR match
Lendl's match against Gomez was actually his opener, so in his final 4 matches of that tournament against the other 4 players ranked in the top 5, he never faced a break point and never conceded more than 4 games in a set. The 2nd set against Gomez, which he came from 3-5 down to win 7-5, was the only time he was under any real pressure.
It's worth pointing out that carpet wasn't really considered to be a particularly 'fast' surface in the 80s as well, and was considered to be a fair one on which players with all styles could do well (both Becker and Lendl played noticeably different on carpet compared to grass).