Which sentence should be revised to eliminate a misconception?

Read the paragraph
(1) Baseball is unique because it is the only sport in
America that does not have a time clock-although tennis
and softball are not timed, either. (2) Instead, games last
for nine innings, unless there is a tie after the ninth, in
which case they go extra innings (3) Nine-inning games
last an average of three hours. (4) Extra innings tack on
time to an already long game, but the end is always the
most exciting part (5) Most people in the US watch
baseball and are fans of their hometown team,
sentence 2
sentence 3
sentence 4
sentence 5