Which records in cricket are unlikely to be broken ever?

Sunil Gavaskar's 36 not out

The first match of the inaugural 1975 ODI world cup displayed one of the most controversial innings of all time. On June 7, 1975, India were playing England at Lords, and Sunil Gavaskar produced one of the most bizarre innings of ODI cricket.
The first half of the game went according to plan. England batted and piled up 334 for 4 in 60 overs, at the time the highest total in one-day cricket. 

The competition rules stated that if a group was tied, run-rate would be the deciding factor. So even if India lost, the more runs they scored, the better their chance of reaching the semi-finals. Such considerations or tactics were, however, sadly lost on Sunil Gavaskar, who opened the Indian innings. From the off, it was apparent that he was adopting a strategy known only to himself. 
By the end of the innings, Gavaskar had crawled to 36 not out off 174 balls with just one four. India had scored 132 for 3 and had lost by 202 runs.

Michael Holding's amazing zero wides in ODI career

Before the modern-day cricket where even spinners can't resist to bowl a wide, Michael Holding achieved what is an unlikely record to be broken over.

His accuracy and command over the ball was as such that he never bowled a single wide in his ODI career in which he bowled over 900 overs (5473 deliveries).

What is even remarkable is that he was once timed at 97 mph(156.1 kph).

 

Bert Vance's 77-run over

In Feb 1990, Bert Vance conceded more than the twice number of runs possible in an over with total legal deliveries, in one of the most weird bowling performances.

It took place during the first-class Shell Trophy match between Wellington and Canterbury in Christchurch. On the final day, Wellington declared their second innings, leaving Canterbury to chase 291 in 59 overs. Chasing, Canterbury slumped to 108 for 8, but Lee Germon and Roger Ford were ready to set the camp for draw and took the team to 196 for 8.

With two overs remaining, Wellington captain planned to give as many runs so that Canterbury reach as close as possible to the target and risk their for the glory. Bert Vance, the Wellington batsman was given bowling who went on to bowl a succession of no-balls. Out of his first 17 balls, only one was legal.

Here's how the over went (underlined ones are legal deliveries) - 
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Yes the confused umpire allowed only five legitimate deliveries.
After his over, only 18 runs were needed. Canterbury made 17 runs, but the scoreboard was still inactive and Ford defended the last delivery of the match with levelled scores.

Romil Dwidedi

Source - Quora