der Spielbeginn
start of play
The time at which a game, competition, or match begins.
Der Spielbeginn wurde wegen des starken Regens um eine Stunde verschoben.
The start of play was postponed by an hour because of the heavy rain.

start of play
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start of play
The time at which a game, competition, or match begins.
Der Spielbeginn wurde wegen des starken Regens um eine Stunde verschoben.
The start of play was postponed by an hour because of the heavy rain.

The word is composed of 'das Spiel' (the game) and 'der Beginn' (the beginning/start). The 's' in the middle is a linking -s that connects the two words. So it literally means the beginning of the game.
Der Spielbeginn ist für 15:30 Uhr angesetzt.
The start of play is scheduled for 3:30 p.m.
In connection with 'Spielbeginn' (start of play), verbs such as 'festlegen' (to set), 'verschieben' (to postpone), or 'ankündigen' (to announce) are often used to describe the status of the starting time.
Der Schiedsrichter hat den Spielbeginn für 20:00 Uhr festgelegt.
The referee set the start of play for 8:00 p.m.
To talk about time in relation to the start of play, you use prepositions such as 'vor' (before), 'nach' (after), or 'bis zu' (up to/until). Pay attention to the dative after these prepositions.
Die Mannschaften wärmen sich vor dem Spielbeginn auf.
The teams are warming up before the start of play.
beginning
'der Beginn' and 'der Spielbeginn' both mean a starting point in time. 'der Beginn' is general and can be used for many kinds of events. 'der Spielbeginn' is more specific and means the time at which a game or competition begins. In sports or for a match, 'Spielbeginn' sounds more precise. Outside this context, you normally say 'Beginn'.

Vor dem Spielbeginn stehen die Fans schon vor dem Stadion.
Before the start of play, the fans are already standing outside the stadium.
Der Beginn der Sitzung ist heute eine halbe Stunde später.
The beginning of the meeting is half an hour later today.