Now for bowling:
Most wickets in 2018 (25 or more):

JJ Bumrah took 48 wickets in the calendar year of his debut, coming 3rd after Alderman (54 in 1981) and Ambrose (49 in 1988). The previous record for India was 40 by Doshi in 1979. A Dananjaya took 27 wickets in his debut calendar year.
The most fivers were 4 by Taijul and Miraz of Bangladesh and Holder of the West Indies. No one took more than one tenner.
Best innings bowling (including all instances of 6wi and above):

The best effort by Maharaj was in a losing cause.
Best match bowling (including all instances of 9wm and above):

Maharaj also figures here with a 12-wicket haul when his side lost. Yasir Shah’s 14-wicket haul was the best in the UAE. He and Imran Khan are the only Pakistani bowlers to have taken 14 wickets in a match.
Bowling averages (Minimum 2000 balls, all instances):

Bumrah has the best average and strike rate, while Anderson has the best economy.
Fielding:
Most dismissals (15 or more):

de Kock and Paine lead, although Dickwella has the most stumpings. Kusal Mendis has the most catches by a non-keeper.
Most innings dismissals (5 or more):

Newcomer Pant is the only one with 6 dismissals. SPD Smith has the most catches by a non-fielder, making him one of several to share this record in all Tests. Saha took 5 catches in each innings of a match.
Most match dismissals (6 or more):

Pant with 11 dismissals shared the world record with Russell and de Villiers. Earlier in the year Saha had an Indian record with 10 dismissals.
The most by a non-keeper was 7 by Rahul, in the only Test which India won on that series. Smith made 6 catches before being disgraced.
Dismissal rate (Minimum 20 innings, 0.500):

de Kock and Paine at the top, leading the others by a large margin. Kusal Mendis has the best by a non-keeper.
All-round performance:
Overall (see criteria in table):

Not a good year for all-rounders, as Cummins is the only one to make the cut with these relatively modest standards.
Match (50 and 5wi):

More good performances, with Cummins’ last-gasp performance at the end. Holder also has two entries here.